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Document IS [NOT] OF, which was added in 7.3.

This commit is contained in:
Bruce Momjian 2007-02-20 00:25:05 +00:00
parent 077d753a57
commit 6126d3e70b
2 changed files with 20 additions and 3 deletions
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18
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.365 2007/02/19 22:51:44 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.366 2007/02/20 00:25:05 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -411,6 +411,22 @@
<literal>IS NOT NULL</literal>, respectively, except that the input
expression must be of Boolean type.
</para>
<para>
<indexterm>
<primary>IS OF</primary>
</indexterm>
<indexterm>
<primary>IS NOT OF</primary>
</indexterm>
It is possible to check the data type of an expression using the
constructs
<synopsis>
<replaceable>expression</replaceable> IS OF (typename, ...)
<replaceable>expression</replaceable> IS NOT OF (typename, ...)
</synopsis>
They return a boolean value based on whether the expression's data
type is one of the listed data types.
</sect1>
<sect1 id="functions-math">

5
doc/src/sgml/syntax.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.115 2007/02/06 09:16:07 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/syntax.sgml,v 1.116 2007/02/20 00:25:05 momjian Exp $ -->
<chapter id="sql-syntax">
<title>SQL Syntax</title>
@ -847,7 +847,8 @@ SELECT (5 !) - 6;
<row>
<entry><token>IS</token></entry>
<entry></entry>
<entry><literal>IS TRUE</>, <literal>IS FALSE</>, <literal>IS UNKNOWN</>, <literal>IS NULL</></entry>
<entry><literal>IS TRUE</>, <literal>IS FALSE</>, <literal>IS
UNKNOWN</>, <literal>IS NULL</>, <literal>IS OF</></entry>
</row>
<row>