Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Tue Oct 9 16:13:00 EDT 2007
+ Last updated: Fri Oct 12 23:36:59 EDT 2007
Current maintainer: Bruce Momjian (bruce@momjian.us)
developers spread throughout the world and communicating via the
Internet. It is a community project and is not controlled by any
company. To get involved, see the developer's FAQ at
- http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html
+ http://www.postgresql.org/docs/faqs.FAQ_DEV.html
1.2) Who controls PostgreSQL?
http://www.commandprompt.com/ppbook/. There are a number of PostgreSQL
books available for purchase. One of the most popular ones is by Korry
Douglas. A list of book reviews can be found at
- http://techdocs.postgresql.org/techdocs/bookreviews.php. There is also
- a collection of PostgreSQL technical articles at
- http://techdocs.postgresql.org/.
+ http://www.postgresql.org/docs/books/. There is also a collection of
+ PostgreSQL technical articles at
+ http://www.postgresql.org/docs/techdocs.
The command line client program psql has some \d commands to show
information about types, operators, functions, aggregates, etc. - use
1.11) How can I learn SQL?
- First, consider the PostgreSQL-specific books mentioned above. Another
- one is "Teach Yourself SQL in 21 Days, Second Edition" at
- http://members.tripod.com/er4ebus/sql/index.htm. Many of our users
- like The Practical SQL Handbook, Bowman, Judith S., et al.,
- Addison-Wesley. Others like The Complete Reference SQL, Groff et al.,
- McGraw-Hill.
+ First, consider the PostgreSQL-specific books mentioned above. Many of
+ our users also like The Practical SQL Handbook, Bowman, Judith S., et
+ al., Addison-Wesley. Others like The Complete Reference SQL, Groff et
+ al., McGraw-Hill.
There are also many nice tutorials available online:
* http://www.intermedia.net/support/sql/sqltut.shtm
4.18) How do I return multiple rows or columns from a function?
It is easy using set-returning functions,
- http://www.postgresql.org/docs/techdocs.17
- .
-
- 4.19) Why do I get "relation with OID ##### does not exist" 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
- is later dropped and recreated, and the function called again, the
- function will fail because the cached function contents still point to
- the old temporary table. The solution is to use EXECUTE for temporary
- table access in PL/PgSQL. This will cause the query to be reparsed
- every time.
+ http://www.postgresql.org/docs/techdocs.17.
4.19) What replication solutions are available?
alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
- <P>Last updated: Tue Oct 9 16:13:00 EDT 2007</P>
+ <P>Last updated: Fri Oct 12 23:36:59 EDT 2007</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:bruce@momjian.us">bruce@momjian.us</A>)
developers spread throughout the world and communicating via the
Internet. It is a community project and is not controlled by any
company. To get involved, see the developer's FAQ at <A href=
- "http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html">
- http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html</A>
+ "http://www.postgresql.org/docs/faqs.FAQ_DEV.html">
+ http://www.postgresql.org/docs/faqs.FAQ_DEV.html</A>
</P>
<H3 id="item1.2">1.2) Who controls PostgreSQL?<BR></H3>
There are a number of PostgreSQL books available for purchase. One
of the most popular ones is by Korry Douglas. A list of book reviews
can be found at <A href=
- "http://techdocs.postgresql.org/techdocs/bookreviews.php">http://techdocs.postgresql.org/techdocs/bookreviews.php</A>.
+ "http://www.postgresql.org/docs/books/">http://www.postgresql.org/docs/books/</A>.
There is also a collection of PostgreSQL technical articles at <A
href=
- "http://techdocs.postgresql.org/">http://techdocs.postgresql.org/</A>.</P>
+ "http://www.postgresql.org/docs/techdocs">http://www.postgresql.org/docs/techdocs</A>.</P>
<P>The command line client program <I>psql</I> has some \d commands to show
information about types, operators, functions, aggregates, etc. - use \? to
<SMALL>SQL</SMALL>?</H3>
<P>First, consider the PostgreSQL-specific books mentioned above.
- Another one is "Teach Yourself SQL in 21 Days, Second Edition"
- at <A href=
- "http://members.tripod.com/er4ebus/sql/index.htm">http://members.tripod.com/er4ebus/sql/index.htm</A>.
- Many of our users like <I>The Practical SQL Handbook</I>,
+ Many of our users also like <I>The Practical SQL Handbook</I>,
Bowman, Judith S., et al., Addison-Wesley. Others like <I>The
Complete Reference SQL</I>, Groff et al., McGraw-Hill.</P>
<DD>A number of <I>postgresql.conf</I> settings affect performance.
For more details, see <a href=
- "http://www.postgresql.org/docs/current/static/runtime.html">
+ "http://www.postgresql.org/docs/current/static/runtime-config.html">
Administration Guide/Server Run-time Environment/Run-time
Configuration</a> for a full listing, and for commentary see <a
href="http://www.varlena.com/varlena/GeneralBits/Tidbits/annotated_conf_e.html">
<P>It is easy using set-returning functions,
<a href="http://www.postgresql.org/docs/techdocs.17">
- http://www.postgresql.org/docs/techdocs.17</a></P>.
-
- <H3 id="item4.19">4.19) Why do I get "relation with OID #####
- does not exist" errors when accessing temporary tables in PL/PgSQL
- functions?</H3>
-
- <P>PL/PgSQL caches function scripts, and an unfortunate side effect
- is that if a PL/PgSQL function accesses a temporary table, and that
- table is later dropped and recreated, and the function called again,
- the function will fail because the cached function contents still
- point to the old temporary table. The solution is to use
- <SMALL>EXECUTE</SMALL> for temporary table access in PL/PgSQL. This
- will cause the query to be reparsed every time.</P>
+ http://www.postgresql.org/docs/techdocs.17</a>.</P>
<H3 id="item4.19">4.19) What replication solutions are available?
</H3>
queries, while slaves can only accept read/<SMALL>SELECT</SMALL>
queries. The most popular freely available master-slave PostgreSQL
replication solution is <A
- href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
+ href="http://main.slony.info/">
Slony-I</A>.</P>
<P>Multi-master replication allows read/write queries to be sent to
double-quotes around table or column names during table creation.
When double-quotes are used, table and column names (called
identifiers) are stored <a
- href="http://www.postgresql.org/docs/current/static/sql-syntax.html#SQL-SYNTAX-IDENTIFIERS">
+ href="http://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS">
case-sensitive</a>, meaning you must use double-quotes when
referencing the names in a query. Some interfaces, like pgAdmin,
automatically double-quote identifiers during table creation.
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