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64 lines
1.9 KiB
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64 lines
1.9 KiB
Plaintext
.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/doc/man/Attic/rename.l,v 1.1.1.1 1996/08/18 22:14:27 scrappy Exp $
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.TH RENAME SQL 02/08/94 Postgres95 Postgres95
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.SH NAME
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rename \(em rename a class or an attribute in a class
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.SH SYNOPSIS
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.nf
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\fBalter table\fR classname1
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\fBrename to\fR classname2
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\fBalter table\fR classname1 [\fB*\fR]
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\fBrename [column]\fR attname1 \fBto\fR attname2
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.fi
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.SH DESCRIPTION
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The
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.BR rename
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command
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causes the name of a class or attribute to change without changing any
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of the data contained in the affected class. Thus, the class or
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attribute will remain of the same type and size after this command is
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executed.
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.PP
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In order to rename an attribute in each class in an entire inheritance
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hierarchy, use the
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.IR classname
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of the superclass and append a \*(lq*\*(rq. (By default, the attribute
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will not be renamed in any of the subclasses.) This should
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.BR always
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be done when changing an attribute name in a superclass. If it is
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not, queries on the inheritance hierarchy such as
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.nf
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select * from super* s
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.fi
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will not work because the subclasses will be (in effect) missing an
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attribute found in the superclass.
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.PP
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You must own the class being modified in order to rename it or part of
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its schema. Renaming any part of the schema of a system catalog is
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not permitted.
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.SH EXAMPLE
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.nf
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--
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-- change the emp class to personnel
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--
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alter table emp rename to personnel
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.fi
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.nf
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--
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-- change the sports attribute to hobbies
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--
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alter table emp rename column sports to hobbies
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.fi
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.nf
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--
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-- make a change to an inherited attribute
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--
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alter table person * rename column last_name to family_name
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.fi
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.SH BUGS
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Execution of historical queries using classes and attributes whose
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names have changed will produce incorrect results in many situations.
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.PP
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Renaming of types, operators, rules, etc., should also be supported.
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