mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-02-11 19:20:40 +08:00
Code Issues Packages Projects Releases Wiki Activity

Copy-editing.

Browse Source
This commit is contained in:
Tom Lane 2001-11-01 04:07:29 +00:00
parent 8304a395f9
commit d14147de77
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
doc/src/sgml/xfunc.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.40 2001/10/26 21:17:03 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.41 2001/11/01 04:07:29 tgl Exp $
-->
<chapter id="xfunc">
@ -72,10 +72,13 @@ $Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.40 2001/10/26 21:17:03 tgl E
<para>
SQL functions execute an arbitrary list of SQL statements, returning
the results of the last query in the list. In the simple (non-set)
the result of the last query in the list, which must be a
<literal>SELECT</>.
In the simple (non-set)
case, the first row of the last query's result will be returned.
(Bear in mind that <quote>the first row</quote> is not well-defined
unless you use <literal>ORDER BY</>.) If the last query happens
(Bear in mind that <quote>the first row</quote> of a multi-row
result is not well-defined unless you use <literal>ORDER BY</>.)
If the last query happens
to return no rows at all, NULL will be returned.
</para>
@ -441,7 +444,8 @@ SELECT name, listchildren(name) FROM nodes;
(5 rows)
</screen>
Notice that no output row appears for Child2, Child3, etc.
In the last SELECT,
notice that no output row appears for Child2, Child3, etc.
This happens because listchildren() returns an empty set
for those inputs, so no output rows are generated.
</para>