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701 lines
28 KiB
Groff
701 lines
28 KiB
Groff
.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/doc/man/Attic/built-in.3,v 1.1.1.1 1996/08/18 22:14:20 scrappy Exp $
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.TH BUILT-INS INTRO 11/05/95 Postgres95 Postgres95
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.SH "DESCRIPTION"
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This section describes the data types, functions and operators
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available to users in Postgres as it is distributed.
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.SH "Built-in and System Types"
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.SH "BUILT-IN TYPES"
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This section describes both
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.BR built-in
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data types.
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These Built-in types are
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are installed in every database.
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.PP
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Users may add new types to Postgres using the
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.IR "define type"
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command described in this manual. User-defined types are not
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described in this section.
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.SH "List of built-in types"
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.PP
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.if n .ta 5 +15 +40
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.if t .ta 0.5i +1.5i +3.0i
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.in 0
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.nf
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\fBPOSTGRES Type\fP \fBMeaning\fP
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abstime absolute date and time
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aclitem access control list item
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bool boolean
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box 2-dimensional rectangle
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bpchar blank-padded characters
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bytea variable length array of bytes
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char character
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char2 array of 2 characters
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char4 array of 4 characters
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char8 array of 8 characters
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char16 array of 16 characters
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cid command identifier type
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date ANSI SQL date type
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filename large object filename
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int alias for int4
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integer alias for int4
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int2 two-byte signed integer
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int28 array of 8 int2
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int4 four-byte signed integer
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float alias for float4
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float4 single-precision floating-point number
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float8 double-precision floating-point number
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lseg 2-dimensional line segment
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name a multi-character type for storing system identifiers
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oid object identifier type
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oid8 array of 8 oid
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oidchar16 oid and char16 composed
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oidint2 oid and int2 composed
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oidint4 oid and int4 composed
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path variable-length array of lseg
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point 2-dimensional geometric point
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polygon 2-dimensional polygon
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real alias for float4
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regproc registered procedure
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reltime relative date and time
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smgr storage manager
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smallint alias for int2
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text variable length array of characters
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tid tuple identifier type
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time ANSI SQL time type
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tinterval time interval
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varchar variable-length characters
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xid transaction identifier type
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.fi
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.in
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.PP
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As a rule, the built-in types are all either (1) internal types, in
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which case the user should not worry about their external format, or
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(2) have obvious formats. The exceptions to this rule are the three
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time types.
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.SH "Syntax of date and time types"
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.SH "ABSOLUTE TIME"
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Absolute time is specified using the following syntax:
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.nf
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Month Day [ Hour : Minute : Second ] Year [ Timezone ]
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.sp
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where
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Month is Jan, Feb, ..., Dec
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Day is 1, 2, ..., 31
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Hour is 01, 02, ..., 24
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Minute is 00, 01, ..., 59
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Second is 00, 01, ..., 59
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Year is 1901, 1902, ..., 2038
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.fi
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Valid dates are from Dec 13 20:45:53 1901 GMT to Jan 19 03:14:04
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2038 GMT. As of Version 3.0, times are no longer read and written
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using Greenwich Mean Time; the input and output routines default to
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the local time zone.
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.PP
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The special absolute time values \*(lqcurrent\*(rq,
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\*(lqinfinity\*(rq and \*(lq-infinity\*(rq are also provided.
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\*(lqinfinity\*(rq specifies a time later than any valid time, and
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\*(lq-infinity\*(rq specifies a time earlier than any valid time.
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\*(lqcurrent\*(rq indicates that the current time should be
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substituted whenever this value appears in a computation.
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.PP
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The strings \*(lqnow\*(rq and \*(lqepoch\*(rq can be used to specify
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time values. \*(lqnow\*(rq means the current time, and differs from
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\*(lqcurrent\*(rq in that the current time is immediately substituted
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for it. \*(lqepoch\*(rq means Jan 1 00:00:00 1970 GMT.
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.SH "RELATIVE TIME"
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Relative time is specified with the following syntax:
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.nf
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@ Quantity Unit [Direction]
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.sp
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where
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Quantity is `1', `2', ...
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Unit is ``second'', ``minute'', ``hour'', ``day'', ``week'',
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``month'' (30-days), or ``year'' (365-days),
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or PLURAL of these units.
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Direction is ``ago''
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.fi
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.PP
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.RB ( Note :
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Valid relative times are less than or equal to 68 years.)
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In addition, the special relative time \*(lqUndefined RelTime\*(rq is
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provided.
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.SH "TIME RANGES"
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Time ranges are specified as:
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.nf
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[ 'abstime' 'abstime']
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.fi
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where
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.IR abstime
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is a time in the absolute time format. Special abstime values such as
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\*(lqcurrent\*(rq, \*(lqinfinity\*(rq and \*(lq-infinity\*(rq can be used.
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.SH "Built-in operators and functions"
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.SH OPERATORS
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Postgres provides a large number of built-in operators on system types.
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These operators are declared in the system catalog
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\*(lqpg_operator\*(rq. Every entry in \*(lqpg_operator\*(rq includes
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the object ID of the procedure that implements the operator.
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.PP
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Users may invoke operators using the operator name, as in
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.nf
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select * from emp where salary < 40000;
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.fi
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Alternatively, users may call the functions that implement the
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operators directly. In this case, the query above would be expressed
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as
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.nf
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select * from emp where int4lt(salary, 40000);
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.fi
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The rest of this section provides a list of the built-in operators and
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the functions that implement them. Binary operators are listed first,
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followed by unary operators.
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.SH "BINARY OPERATORS"
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This list was generated from the Postgres system catalogs with the
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query:
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.nf
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SELECT
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t0.typname AS result,
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t1.typname AS left_type,
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t2.typname AS right_type,
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o.oprname AS operatr,
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p.proname AS func_name
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FROM pg_proc p, pg_type t0,
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pg_type t1, pg_type t2,
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pg_operator o
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WHERE p.prorettype = t0.oid AND
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RegprocToOid(o.oprcode) = p.oid AND
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p.pronargs = 2 AND
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o.oprleft = t1.oid AND
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o.oprright = t2.oid
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ORDER BY result, left_type, right_type, operatr;
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.fi
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These operations are cast in terms of SQL types and so are
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.BR not
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directly usable as C function prototypes.
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.nf
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Operators:
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general
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<\(eq less or equal
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<> inequality
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< less than
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<\(eq greater or equal
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>\(eq greater or equal
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> greater than
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\(eq equality
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~ A matches regular expression B, case-sensitive
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!~ A does not match regular expression B, case-sensitive
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~* A matches regular expression B, case-insensitive.
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!~* A does not match regular expression B, case-insensitive
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~~ A matches LIKE expression B, case-sensitive
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!~~ A does not match LIKE expression B, case-sensitive
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+ addition
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\(mi subtraction
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* multiplication
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/ division
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% modulus
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@ absolute value
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float8
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^ exponentiation
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% truncate to integer
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|/ square root
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||/ cube root
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: exponential function
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; natural logarithm
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point
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!< A is left of B
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!> A is right of B
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!^ A is above B
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!| A is below B
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\(eq|\(eq equality
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===> point inside box
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===` point on path
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<===> distance between points
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box
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&& boxes overlap
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&< box A overlaps box B, but does not extend to right of box B
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&> box A overlaps box B, but does not extend to left of box B
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<< A is left of B
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\(eq area equal
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< area less than
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<\(eq area less or equal
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>\(eq area greater or equal
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> area greater than
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>> A is right of B
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@ A is contained in B
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~\(eq box equality
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~= A same as B
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~ A contains B
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@@ center of box
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polygon
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&& polygons overlap
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&< A overlaps B but does not extend to right of B
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&> A overlaps B but does not extend to left of B
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<< A is left of B
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>> A is right of B
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@ A is contained by B
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~\(eq equality
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~= A same as B
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~ A contains B
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tinterval
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#<\(eq interval length less or equal reltime
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#<> interval length not equal to reltime.
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#< interval length less than reltime
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#\(eq interval length equal to reltime
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#>\(eq interval length greater or equal reltime
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#> interval length greater than reltime
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&& intervals overlap
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<< A contains B
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\(eq equality
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<> interval bounded by two abstimes
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<?> abstime in tinterval
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| start of interval
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<#> convert to interval
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result |left_type |right_type|operatr|func_name
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---------+----------+----------+-------+---------------
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_aclitem |_aclitem |aclitem |+ |aclinsert
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_aclitem |_aclitem |aclitem |- |aclremove
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abstime |abstime |reltime |+ |timepl
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abstime |abstime |reltime |- |timemi
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bool |_abstime |_abstime |= |array_eq
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bool |_aclitem |_aclitem |= |array_eq
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bool |_aclitem |aclitem |~ |aclcontains
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bool |_bool |_bool |= |array_eq
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bool |_box |_box |= |array_eq
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bool |_bytea |_bytea |= |array_eq
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bool |_char |_char |= |array_eq
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bool |_char16 |_char16 |= |array_eq
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bool |_cid |_cid |= |array_eq
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bool |_filename |_filename |= |array_eq
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bool |_float4 |_float4 |= |array_eq
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bool |_float8 |_float8 |= |array_eq
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bool |_int2 |_int2 |= |array_eq
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bool |_int28 |_int28 |= |array_eq
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bool |_int4 |_int4 |= |array_eq
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bool |_lseg |_lseg |= |array_eq
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bool |_name |_name |= |array_eq
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bool |_oid |_oid |= |array_eq
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bool |_oid8 |_oid8 |= |array_eq
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bool |_path |_path |= |array_eq
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bool |_point |_point |= |array_eq
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bool |_polygon |_polygon |= |array_eq
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bool |_ref |_ref |= |array_eq
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bool |_regproc |_regproc |= |array_eq
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bool |_reltime |_reltime |= |array_eq
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bool |_stub |_stub |= |array_eq
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bool |_text |_text |= |array_eq
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bool |_tid |_tid |= |array_eq
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bool |_tinterval|_tinterval|= |array_eq
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bool |_xid |_xid |= |array_eq
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bool |abstime |abstime |< |abstimelt
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bool |abstime |abstime |<= |abstimele
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bool |abstime |abstime |<> |abstimene
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bool |abstime |abstime |= |abstimeeq
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bool |abstime |abstime |> |abstimegt
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bool |abstime |abstime |>= |abstimege
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bool |abstime |tinterval |<?> |ininterval
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bool |bool |bool |<> |boolne
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bool |bool |bool |= |booleq
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bool |box |box |&& |box_overlap
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bool |box |box |&< |box_overleft
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bool |box |box |&> |box_overright
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bool |box |box |< |box_lt
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bool |box |box |<< |box_left
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bool |box |box |<= |box_le
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bool |box |box |= |box_eq
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bool |box |box |> |box_gt
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bool |box |box |>= |box_ge
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bool |box |box |>> |box_right
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bool |box |box |@ |box_contained
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bool |box |box |~ |box_contain
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bool |box |box |~= |box_same
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bool |bpchar |bpchar |< |bpcharlt
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bool |bpchar |bpchar |<= |bpcharle
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bool |bpchar |bpchar |<> |bpcharne
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bool |bpchar |bpchar |= |bpchareq
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bool |bpchar |bpchar |> |bpchargt
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bool |bpchar |bpchar |>= |bpcharge
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bool |bpchar |text |!~ |textregexne
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bool |bpchar |text |!~* |texticregexne
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bool |bpchar |text |!~~ |textnlike
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bool |bpchar |text |~ |textregexeq
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bool |bpchar |text |~* |texticregexeq
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bool |bpchar |text |~~ |textlike
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bool |char |char |< |charlt
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bool |char |char |<= |charle
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bool |char |char |<> |charne
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bool |char |char |= |chareq
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bool |char |char |> |chargt
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bool |char |char |>= |charge
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bool |char16 |char16 |< |char16lt
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bool |char16 |char16 |<= |char16le
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bool |char16 |char16 |<> |char16ne
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bool |char16 |char16 |= |char16eq
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bool |char16 |char16 |> |char16gt
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bool |char16 |char16 |>= |char16ge
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bool |char16 |text |!~ |char16regexne
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bool |char16 |text |!~* |char16icregexne
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bool |char16 |text |!~~ |char16nlike
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bool |char16 |text |!~~ |char16nlike
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bool |char16 |text |~ |char16regexeq
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bool |char16 |text |~* |char16icregexeq
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bool |char16 |text |~~ |char16like
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bool |char16 |text |~~ |char16like
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bool |char2 |char2 |< |char2lt
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bool |char2 |char2 |<= |char2le
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bool |char2 |char2 |<> |char2ne
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bool |char2 |char2 |= |char2eq
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bool |char2 |char2 |> |char2gt
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bool |char2 |char2 |>= |char2ge
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bool |char2 |text |!~ |char2regexne
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bool |char2 |text |!~* |char2icregexne
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bool |char2 |text |!~~ |char2nlike
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bool |char2 |text |~ |char2regexeq
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bool |char2 |text |~* |char2icregexeq
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bool |char2 |text |~~ |char2like
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bool |char4 |char4 |< |char4lt
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bool |char4 |char4 |<= |char4le
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bool |char4 |char4 |<> |char4ne
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bool |char4 |char4 |= |char4eq
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bool |char4 |char4 |> |char4gt
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bool |char4 |char4 |>= |char4ge
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bool |char4 |text |!~ |char4regexne
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bool |char4 |text |!~* |char4icregexne
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bool |char4 |text |!~~ |char4nlike
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bool |char4 |text |~ |char4regexeq
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bool |char4 |text |~* |char4icregexeq
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bool |char4 |text |~~ |char4like
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bool |char8 |char8 |< |char8lt
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bool |char8 |char8 |<= |char8le
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bool |char8 |char8 |<> |char8ne
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bool |char8 |char8 |= |char8eq
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bool |char8 |char8 |> |char8gt
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bool |char8 |char8 |>= |char8ge
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bool |char8 |text |!~ |char8regexne
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bool |char8 |text |!~* |char8icregexne
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bool |char8 |text |!~~ |char8nlike
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bool |char8 |text |~ |char8regexeq
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bool |char8 |text |~* |char8icregexeq
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bool |char8 |text |~~ |char8like
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bool |date |date |< |date_lt
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bool |date |date |<= |date_le
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bool |date |date |<> |date_ne
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bool |date |date |= |date_eq
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bool |date |date |> |date_gt
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bool |date |date |>= |date_ge
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bool |float4 |float4 |< |float4lt
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bool |float4 |float4 |<= |float4le
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bool |float4 |float4 |<> |float4ne
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bool |float4 |float4 |= |float4eq
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bool |float4 |float4 |> |float4gt
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bool |float4 |float4 |>= |float4ge
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bool |float4 |float8 |< |float48lt
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bool |float4 |float8 |<= |float48le
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bool |float4 |float8 |<> |float48ne
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bool |float4 |float8 |= |float48eq
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bool |float4 |float8 |> |float48gt
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bool |float4 |float8 |>= |float48ge
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bool |float8 |float4 |< |float84lt
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bool |float8 |float4 |<= |float84le
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bool |float8 |float4 |<> |float84ne
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bool |float8 |float4 |= |float84eq
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bool |float8 |float4 |> |float84gt
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bool |float8 |float4 |>= |float84ge
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bool |float8 |float8 |< |float8lt
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bool |float8 |float8 |<= |float8le
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bool |float8 |float8 |<> |float8ne
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bool |float8 |float8 |= |float8eq
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bool |float8 |float8 |> |float8gt
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bool |float8 |float8 |>= |float8ge
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bool |int2 |int2 |< |int2lt
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bool |int2 |int2 |<= |int2le
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bool |int2 |int2 |<> |int2ne
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bool |int2 |int2 |= |int2eq
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bool |int2 |int2 |> |int2gt
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bool |int2 |int2 |>= |int2ge
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bool |int4 |int4 |< |int4lt
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bool |int4 |int4 |<= |int4le
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bool |int4 |int4 |<> |int4ne
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bool |int4 |int4 |= |int4eq
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bool |int4 |int4 |> |int4gt
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bool |int4 |int4 |>= |int4ge
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bool |int4 |name |!!= |int4notin
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bool |int4 |oid |= |int4eqoid
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bool |name |name |< |namelt
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bool |name |name |<= |namele
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bool |name |name |<> |namene
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bool |name |name |= |nameeq
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bool |name |name |> |namegt
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bool |name |name |>= |namege
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bool |name |text |!~ |nameregexne
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bool |name |text |!~* |nameicregexne
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bool |name |text |!~~ |namenlike
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bool |name |text |~ |nameregexeq
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bool |name |text |~* |nameicregexeq
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bool |name |text |~~ |namelike
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bool |oid |int4 |= |oideqint4
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bool |oid |name |!!= |oidnotin
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bool |oid |oid |< |int4lt
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bool |oid |oid |<= |int4le
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bool |oid |oid |<> |oidne
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bool |oid |oid |= |oideq
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bool |oid |oid |> |int4gt
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bool |oid |oid |>= |int4ge
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bool |oidint2 |oidint2 |< |oidint2lt
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bool |oidint2 |oidint2 |<= |oidint2le
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bool |oidint2 |oidint2 |<> |oidint2ne
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bool |oidint2 |oidint2 |= |oidint2eq
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bool |oidint2 |oidint2 |> |oidint2gt
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bool |oidint2 |oidint2 |>= |oidint2ge
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|
bool |oidint4 |oidint4 |< |oidint4lt
|
|
bool |oidint4 |oidint4 |<= |oidint4le
|
|
bool |oidint4 |oidint4 |<> |oidint4ne
|
|
bool |oidint4 |oidint4 |= |oidint4eq
|
|
bool |oidint4 |oidint4 |> |oidint4gt
|
|
bool |oidint4 |oidint4 |>= |oidint4ge
|
|
bool |oidname |oidname |< |oidnamelt
|
|
bool |oidname |oidname |<= |oidnamele
|
|
bool |oidname |oidname |<> |oidnamene
|
|
bool |oidname |oidname |= |oidnameeq
|
|
bool |oidname |oidname |> |oidnamegt
|
|
bool |oidname |oidname |>= |oidnamege
|
|
bool |point |box |===> |on_pb
|
|
bool |point |path |===` |on_ppath
|
|
bool |point |point |!< |point_left
|
|
bool |point |point |!> |point_right
|
|
bool |point |point |!^ |point_above
|
|
bool |point |point |!\| |point_below
|
|
bool |point |point |=\|= |point_eq
|
|
bool |polygon |polygon |&& |poly_overlap
|
|
bool |polygon |polygon |&< |poly_overleft
|
|
bool |polygon |polygon |&> |poly_overright
|
|
bool |polygon |polygon |<< |poly_left
|
|
bool |polygon |polygon |>> |poly_right
|
|
bool |polygon |polygon |@ |poly_contained
|
|
bool |polygon |polygon |~ |poly_contain
|
|
bool |polygon |polygon |~= |poly_same
|
|
bool |reltime |reltime |< |reltimelt
|
|
bool |reltime |reltime |<= |reltimele
|
|
bool |reltime |reltime |<> |reltimene
|
|
bool |reltime |reltime |= |reltimeeq
|
|
bool |reltime |reltime |> |reltimegt
|
|
bool |reltime |reltime |>= |reltimege
|
|
bool |text |text |!~ |textregexne
|
|
bool |text |text |!~* |texticregexne
|
|
bool |text |text |!~~ |textnlike
|
|
bool |text |text |< |text_lt
|
|
bool |text |text |<= |text_le
|
|
bool |text |text |<> |textne
|
|
bool |text |text |= |texteq
|
|
bool |text |text |> |text_gt
|
|
bool |text |text |>= |text_ge
|
|
bool |text |text |~ |textregexeq
|
|
bool |text |text |~* |texticregexeq
|
|
bool |text |text |~~ |textlike
|
|
bool |time |time |< |time_lt
|
|
bool |time |time |<= |time_le
|
|
bool |time |time |<> |time_ne
|
|
bool |time |time |= |time_eq
|
|
bool |time |time |> |time_gt
|
|
bool |time |time |>= |time_ge
|
|
bool |tinterval |reltime |#< |intervallenlt
|
|
bool |tinterval |reltime |#<= |intervallenle
|
|
bool |tinterval |reltime |#<> |intervallenne
|
|
bool |tinterval |reltime |#= |intervalleneq
|
|
bool |tinterval |reltime |#> |intervallengt
|
|
bool |tinterval |reltime |#>= |intervallenge
|
|
bool |tinterval |tinterval |&& |intervalov
|
|
bool |tinterval |tinterval |<< |intervalct
|
|
bool |tinterval |tinterval |= |intervaleq
|
|
bool |varchar |text |!~ |textregexne
|
|
bool |varchar |text |!~* |texticregexne
|
|
bool |varchar |text |!~~ |textnlike
|
|
bool |varchar |text |~ |textregexeq
|
|
bool |varchar |text |~* |texticregexeq
|
|
bool |varchar |text |~~ |textlike
|
|
bool |varchar |varchar |< |varcharlt
|
|
bool |varchar |varchar |<= |varcharle
|
|
bool |varchar |varchar |<> |varcharne
|
|
bool |varchar |varchar |= |varchareq
|
|
bool |varchar |varchar |> |varchargt
|
|
bool |varchar |varchar |>= |varcharge
|
|
char |char |char |* |charmul
|
|
char |char |char |+ |charpl
|
|
char |char |char |- |charmi
|
|
char |char |char |/ |chardiv
|
|
float4 |float4 |float4 |* |float4mul
|
|
float4 |float4 |float4 |+ |float4pl
|
|
float4 |float4 |float4 |- |float4mi
|
|
float4 |float4 |float4 |/ |float4div
|
|
float8 |float4 |float8 |* |float48mul
|
|
float8 |float4 |float8 |+ |float48pl
|
|
float8 |float4 |float8 |- |float48mi
|
|
float8 |float4 |float8 |/ |float48div
|
|
float8 |float8 |float4 |* |float84mul
|
|
float8 |float8 |float4 |+ |float84pl
|
|
float8 |float8 |float4 |- |float84mi
|
|
float8 |float8 |float4 |/ |float84div
|
|
float8 |float8 |float8 |* |float8mul
|
|
float8 |float8 |float8 |+ |float8pl
|
|
float8 |float8 |float8 |- |float8mi
|
|
float8 |float8 |float8 |/ |float8div
|
|
float8 |float8 |float8 |^ |dpow
|
|
int2 |int2 |int2 |% |int2mod
|
|
int2 |int2 |int2 |* |int2mul
|
|
int2 |int2 |int2 |+ |int2pl
|
|
int2 |int2 |int2 |- |int2mi
|
|
int2 |int2 |int2 |/ |int2div
|
|
int4 |int2 |int4 |% |int24mod
|
|
int4 |int2 |int4 |* |int24mul
|
|
int4 |int2 |int4 |+ |int24pl
|
|
int4 |int2 |int4 |- |int24mi
|
|
int4 |int2 |int4 |/ |int24div
|
|
int4 |int2 |int4 |< |int24lt
|
|
int4 |int2 |int4 |<= |int24le
|
|
int4 |int2 |int4 |<> |int24ne
|
|
int4 |int2 |int4 |= |int24eq
|
|
int4 |int2 |int4 |> |int24gt
|
|
int4 |int2 |int4 |>= |int24ge
|
|
int4 |int4 |int2 |% |int42mod
|
|
int4 |int4 |int2 |* |int42mul
|
|
int4 |int4 |int2 |+ |int42pl
|
|
int4 |int4 |int2 |- |int42mi
|
|
int4 |int4 |int2 |/ |int42div
|
|
int4 |int4 |int2 |< |int42lt
|
|
int4 |int4 |int2 |<= |int42le
|
|
int4 |int4 |int2 |<> |int42ne
|
|
int4 |int4 |int2 |= |int42eq
|
|
int4 |int4 |int2 |> |int42gt
|
|
int4 |int4 |int2 |>= |int42ge
|
|
int4 |int4 |int4 |% |int4mod
|
|
int4 |int4 |int4 |* |int4mul
|
|
int4 |int4 |int4 |+ |int4pl
|
|
int4 |int4 |int4 |- |int4mi
|
|
int4 |int4 |int4 |/ |int4div
|
|
int4 |point |point |<===> |pointdist
|
|
tinterval|abstime |abstime |<#> |mktinterval
|
|
|
|
|
|
.fi
|
|
.SH "LEFT UNARY OPERATORS"
|
|
The table below gives the left unary operators that are
|
|
registered in the system catalogs.
|
|
|
|
This list was generated from the Postgres system catalogs with the query:
|
|
|
|
.nf
|
|
SELECT o.oprname AS left_unary,
|
|
right.typname AS operand,
|
|
result.typname AS return_type
|
|
FROM pg_operator o, pg_type right, pg_type result
|
|
WHERE o.oprkind = 'l' AND -- left unary
|
|
o.oprright = right.oid AND
|
|
o.oprresult = result.oid
|
|
ORDER BY operand;
|
|
|
|
left_unary|operand |return_type
|
|
----------+---------+-----------
|
|
@@ |box |point
|
|
@ |float4 |float4
|
|
- |float4 |float4
|
|
; |float8 |float8
|
|
: |float8 |float8
|
|
% |float8 |float8
|
|
\|\|/ |float8 |float8
|
|
\|/ |float8 |float8
|
|
@ |float8 |float8
|
|
- |float8 |float8
|
|
- |int2 |int2
|
|
- |int4 |int4
|
|
!! |int4 |int4
|
|
\| |tinterval|abstime
|
|
|
|
.fi
|
|
.in
|
|
.SH "RIGHT UNARY OPERATORS"
|
|
The table below gives the right unary operators that are
|
|
registered in the system catalogs.
|
|
|
|
This list was generated from the Postgres system catalogs with the query:
|
|
|
|
.nf
|
|
SELECT o.oprname AS right_unary,
|
|
left.typname AS operand,
|
|
result.typname AS return_type
|
|
FROM pg_operator o, pg_type left, pg_type result
|
|
WHERE o.oprkind = 'r' AND -- right unary
|
|
o.oprleft = left.oid AND
|
|
o.oprresult = result.oid
|
|
ORDER BY operand;
|
|
|
|
right_unary|operand|return_type
|
|
-----------+-------+-----------
|
|
% |float8 |float8
|
|
! |int4 |int4
|
|
|
|
.fi
|
|
.in
|
|
.SH "AGGREGATE FUNCTIONS"
|
|
The table below gives the aggregate functions that are
|
|
registered in the system catalogs.
|
|
|
|
This list was generated from the Postgres system catalogs with the query:
|
|
|
|
.nf
|
|
SELECT a.aggname, t.typname
|
|
FROM pg_aggregate a, pg_type t
|
|
WHERE a.aggbasetype = t.oid
|
|
ORDER BY aggname, typname;
|
|
|
|
aggname|typname
|
|
-------+-------
|
|
avg |float4
|
|
avg |float8
|
|
avg |int2
|
|
avg |int4
|
|
max |float4
|
|
max |float8
|
|
max |int2
|
|
max |int4
|
|
min |float4
|
|
min |float8
|
|
min |int2
|
|
min |int4
|
|
sum |float4
|
|
sum |float8
|
|
sum |int2
|
|
sum |int4
|
|
|
|
\fBcount\fR is also available.
|
|
|
|
.fi
|
|
.in
|
|
.SH "SEE ALSO"
|
|
For examples on specifying literals of built-in types, see
|
|
.IR SQL(l).
|
|
.SH BUGS
|
|
.PP
|
|
Although most of the input and output functions correponding to the
|
|
base types (e.g., integers and floating point numbers) do some
|
|
error-checking, none of them are particularly rigorous about it. More
|
|
importantly, almost none of the operators and functions (e.g.,
|
|
addition and multiplication) perform any error-checking at all.
|
|
Consequently, many of the numeric operations will (for example)
|
|
silently underflow or overflow.
|
|
.PP
|
|
Some of the input and output functions are not invertible. That is,
|
|
the result of an output function may lose precision when compared to
|
|
the original input.
|