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Provide some documentation for EXISTS, IN, NOT IN, ANY/SOME/ALL,

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and row comparisons.  How'd this manage to slip through the cracks?
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Tom Lane
2001-12-01 04:19:20 +00:00
parent ac06a7a21f
commit 53f1173388
2 changed files with 436 additions and 5 deletions
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8
doc/src/sgml/syntax.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.53 2001/11/28 20:49:10 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.54 2001/12/01 04:19:20 tgl Exp $
-->
<chapter id="sql-syntax">
@@ -845,7 +845,11 @@ CAST ( '<replaceable>string</replaceable>' AS <replaceable>type</replaceable> )
<command>SELECT</command> in parentheses that returns exactly one
row with one column. It is an error to use a subquery that
returns more than one row or more than one column in the context
of a value expression.
of a value expression. (But if, during a particular execution, the
subquery returns no rows, the scalar result is taken to be NULL.)
The subquery can refer to variables from the surrounding query,
which will act as constants during any one evaluation of the subquery.
See also <xref linkend="functions-subquery">.
</para>
</listitem>
</itemizedlist>