diff --git a/doc/FAQ b/doc/FAQ
index d5a4f486081..6f1f456ca33 100644
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Wed Feb 2 12:44:03 EST 2005
+ Last updated: Thu Feb 24 19:33:07 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@@ -59,7 +59,8 @@
4.8) How do I perform regular expression searches and case-insensitive
regular expression searches? How do I use an index for
case-insensitive searches?
- 4.9) In a query, how do I detect if a field is NULL?
+ 4.9) In a query, how do I detect if a field is NULL? How can I sort on
+ whether a field is NULL or not?
4.10) What is the difference between the various character types?
4.11.1) How do I create a serial/auto-incrementing field?
4.11.2) How do I get the value of a SERIAL insert?
@@ -76,8 +77,8 @@
4.17) How do I perform an outer join?
4.18) How do I perform queries using multiple databases?
4.19) How do I return multiple rows or columns from a function?
- 4.20) Why can't I reliably create/drop temporary tables in PL/PgSQL
- functions?
+ 4.20) Why do I get "missing oid" errors when accessing temporary
+ tables in PL/PgSQL functions?
4.21) What encryption options are available?
Extending PostgreSQL
@@ -119,7 +120,8 @@
PostgreSQL Data Base Management System
Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
- Portions Copyright (c) 1994-6 Regents of the University of California
+ Portions Copyright (c) 1994-1996 Regents of the University of
+ California
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose, without fee, and without a written
@@ -160,7 +162,8 @@
1.4) Where can I get PostgreSQL?
The primary anonymous ftp site for PostgreSQL is
- ftp://ftp.PostgreSQL.org/pub. For mirror sites, see our main web site.
+ ftp://ftp.PostgreSQL.org/pub/. For mirror sites, see our main web
+ site.
1.5) Where can I get support?
@@ -177,14 +180,14 @@
EFNet.
A list of commercial support companies is available at
- http://techdocs.postg resql.org/companies.php.
+ http://techdocs.postgresql.org/companies.php.
1.6) How do I submit a bug report?
Visit the PostgreSQL bug form at
http://www.postgresql.org/support/submitbug.
- Also check out our ftp site ftp://ftp.PostgreSQL.org/pub to see if
+ Also check out our ftp site ftp://ftp.PostgreSQL.org/pub/ to see if
there is a more recent PostgreSQL version.
1.7) What is the latest release?
@@ -200,7 +203,7 @@
also browse the manuals online at http://www.PostgreSQL.org/docs.
There are two PostgreSQL books available online at
- http://www.PostgreSQL.org/docs/awbook.html and
+ http://www.postgresql.org/docs/books/awbook.html and
http://www.commandprompt.com/ppbook/. There is a list of PostgreSQL
books available for purchase at
http://techdocs.PostgreSQL.org/techdocs/bookreviews.php. There is also
@@ -220,9 +223,10 @@
1.10) How can I learn SQL?
- The PostgreSQL book at http://www.PostgreSQL.org/docs/awbook.html
- teaches SQL. There is another PostgreSQL book at
- http://www.commandprompt.com/ppbook. There is a nice tutorial at
+ The PostgreSQL book at
+ http://www.postgresql.org/docs/books/awbook.html teaches SQL. There is
+ another PostgreSQL book at http://www.commandprompt.com/ppbook. There
+ is a nice tutorial at
http://www.intermedia.net/support/sql/sqltut.shtm, at
http://ourworld.compuserve.com/homepages/graeme_birchall/HTM_COOK.HTM,
and at http://sqlcourse.com.
@@ -317,15 +321,15 @@
For Web integration, PHP (http://www.php.net) is an excellent
interface.
- For complex cases, many use the Perl and CGI.pm or mod_perl.
+ For complex cases, many use the Perl DBD::Pg with CGI.pm or mod_perl.
2.3) Does PostgreSQL have a graphical user interface?
Yes, there are several graphical interfaces to PostgreSQL available.
These include pgAdmin III (http://www.pgadmin.org, PgAccess
- http://www.pgaccess.org), RHDB Admin (http://sources.redhat.com/rhd b/
- ), TORA (http://www.globecom.net/tora/, partly commercial), and Rekall
- ( http://www.rekallrevealed.org/). There is also PhpPgAdmin (
+ http://www.pgaccess.org), RHDB Admin (http://sources.redhat.com/rhdb/
+ ), TORA ( http://www.globecom.net/tora/, partly commercial), and
+ Rekall ( http://www.rekallrevealed.org/). There is also PhpPgAdmin (
http://phppgadmin.sourceforge.net/ ), a web-based interface to
PostgreSQL.
@@ -633,10 +637,22 @@
expresssion index, it will be used:
CREATE INDEX tabindex ON tab (lower(col));
- 4.9) In a query, how do I detect if a field is NULL?
+ 4.9) In a query, how do I detect if a field is NULL? How can I sort on
+ whether a field is NULL or not?
You test the column with IS NULL and IS NOT NULL.
-
+ SELECT *
+ FROM tab
+ WHERE col IS NULL;
+
+ To sort by the NULL status, use the IS NULL and IS NOT NULL modifiers
+ in your WHERE clause. Things that are true will sort higher than
+ things that are false, so the following will put NULL entries at the
+ top of the resulting list:
+ SELECT *
+ FROM tab
+ ORDER BY (col IS NOT NULL)
+
4.10) What is the difference between the various character types?
Type Internal Name Notes
@@ -804,8 +820,8 @@
It is easy using set-returning functions,
http://techdocs.postgresql.org/guides/SetReturningFunctions.
- 4.20) Why can't I reliably create/drop temporary tables in PL/PgSQL
- functions?
+ 4.20) Why do I get "missing oid" errors when accessing temporary tables in
+ PL/PgSQL functions?
PL/PgSQL caches function scripts, and an unfortunate side effect is
that if a PL/PgSQL function accesses a temporary table, and that table
diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html
index c77ef9a36bb..d328aa639a5 100644
--- a/doc/src/FAQ/FAQ.html
+++ b/doc/src/FAQ/FAQ.html
@@ -10,7 +10,7 @@
alink="#0000ff">
Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Wed Feb 2 12:44:03 EST 2005
+ Last updated: Thu Feb 24 19:33:07 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@@ -85,7 +85,8 @@
searches and case-insensitive regular expression searches? How do I
use an index for case-insensitive searches?
4.9) In a query, how do I detect if a field
- is NULL?
+ is NULL? How can I sort on whether a field is
+ NULL or not?
4.10) What is the difference between the
various character types?
4.11.1) How do I create a
@@ -112,8 +113,8 @@
databases?
4.19) How do I return multiple rows or columns
from a function?
- 4.20) Why can't I reliably create/drop
- temporary tables in PL/PgSQL functions?
+ 4.20) Why do I get "missing oid" errors when
+ accessing temporary tables in PL/PgSQL functions?
4.21) What encryption options are available?
@@ -162,7 +163,7 @@
PostgreSQL Data Base Management System
Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
- Portions Copyright (c) 1994-6 Regents of the University of California
+ Portions Copyright (c) 1994-1996 Regents of the University of California
Permission to use, copy, modify, and distribute this software
and its documentation for any purpose, without fee, and without a
@@ -206,7 +207,7 @@
1.4) Where can I get PostgreSQL?
The primary anonymous ftp site for PostgreSQL is ftp://ftp.PostgreSQL.org/pub.
+ "ftp://ftp.PostgreSQL.org/pub/">ftp://ftp.PostgreSQL.org/pub/.
For mirror sites, see our main web site.
1.5) Where can I get support?
@@ -225,8 +226,8 @@
(#postgresqlfr). There is also a PostgreSQL channel on EFNet.
A list of commercial support companies is available at http://techdocs.postg
- resql.org/companies.php.
+ "http://techdocs.postgresql.org/companies.php">
+ http://techdocs.postgresql.org/companies.php.
1.6) How do I submit a bug report?
@@ -235,7 +236,7 @@
http://www.postgresql.org/support/submitbug.
Also check out our ftp site ftp://ftp.PostgreSQL.org/pub to
+ "ftp://ftp.PostgreSQL.org/pub/">ftp://ftp.PostgreSQL.org/pub/ to
see if there is a more recent PostgreSQL version.
1.7) What is the latest release?
@@ -253,7 +254,7 @@
There are two PostgreSQL books available online at http://www.PostgreSQL.org/docs/awbook.html
+ "http://www.postgresql.org/docs/books/awbook.html">http://www.postgresql.org/docs/books/awbook.html
and http://www.commandprompt.com/ppbook/.
There is a list of PostgreSQL books available for purchase at SQL?
The PostgreSQL book at http://www.PostgreSQL.org/docs/awbook.html
+ "http://www.postgresql.org/docs/books/awbook.html">http://www.postgresql.org/docs/books/awbook.html
teaches SQL. There is another PostgreSQL book at http://www.commandprompt.com/ppbook.
@@ -411,7 +412,8 @@
href="http://www.php.net">http://www.php.net) is an excellent
interface.
- For complex cases, many use the Perl and CGI.pm or mod_perl.
+ For complex cases, many use the Perl DBD::Pg with CGI.pm or
+ mod_perl.
2.3) Does PostgreSQL have a graphical user
interface?
@@ -421,10 +423,9 @@
href="http://www.pgadmin.org">http://www.pgadmin.org, PgAccess
http://www.pgaccess.org),
RHDB Admin (http://sources.redhat.com/rhd
- b/ ), TORA (http://www.globecom.net/tora/,
- partly commercial), and Rekall (http://sources.redhat.com/rhdb/
+ ), TORA (
+ http://www.globecom.net/tora/, partly commercial), and Rekall (
http://www.rekallrevealed.org/). There is also PhpPgAdmin (
@@ -815,11 +816,29 @@ table?unlimited |
4.9) In a query, how do I detect if a field
- is NULL?
+ is NULL? How can I sort on whether a field is
+ NULL or not?
You test the column with IS NULL and IS
NOT NULL.
+
+ SELECT *
+ FROM tab
+ WHERE col IS NULL;
+
+
+ To sort by the NULL status, use the IS NULL
+ and IS NOT NULL modifiers in your WHERE clause.
+ Things that are true will sort higher than things that are false,
+ so the following will put NULL entries at the top of the resulting list:
+
+
+ SELECT *
+ FROM tab
+ ORDER BY (col IS NOT NULL)
+
+
4.10) What is the difference between the
various character types?
@@ -1039,8 +1058,8 @@ length
http://techdocs.postgresql.org/guides/SetReturningFunctions.
- 4.20) Why can't I reliably create/drop
- temporary tables in PL/PgSQL functions?
+ 4.20) Why do I get "missing oid" errors when
+ accessing temporary tables in PL/PgSQL functions?
PL/PgSQL caches function scripts, and an unfortunate side effect
is that if a PL/PgSQL function accesses a temporary table, and that