-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.341 2006/09/28 20:51:41 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.342 2006/09/29 18:36:45 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
<primary>IS NOT DISTINCT FROM</primary>
</indexterm>
- <indexterm>
- <primary>IS NULL</primary>
- </indexterm>
-
- <indexterm>
- <primary>IS NOT NULL</primary>
- </indexterm>
-
<para>
This section describes several specialized constructs for making
multiple comparisons between groups of values. These forms are
be either true or false, never null.
</para>
-<synopsis>
-<replaceable>row_constructor</replaceable> IS NULL
-<replaceable>row_constructor</replaceable> IS NOT NULL
-</synopsis>
-
- <para>
- These constructs test a row value for null or not null. A row value
- is considered not null if it has at least one field that is not null.
- </para>
-
</sect2>
</sect1>