From d14147de77244e32eacfdf3d205a8a75c8c51784 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 1 Nov 2001 04:07:29 +0000
Subject: [PATCH] Copy-editing.
---
doc/src/sgml/xfunc.sgml | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/doc/src/sgml/xfunc.sgml b/doc/src/sgml/xfunc.sgml
index 529bdec3ef9..e3c36d03974 100644
--- a/doc/src/sgml/xfunc.sgml
+++ b/doc/src/sgml/xfunc.sgml
@@ -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>
--
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