diff options
| -rw-r--r-- | doc/src/sgml/func.sgml | 18 | ||||
| -rw-r--r-- | doc/src/sgml/syntax.sgml | 5 |
2 files changed, 20 insertions, 3 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 2f4e4d165d8..45b70621d7a 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -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"> diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml index ad702f63263..a9bd06a03ee 100644 --- a/doc/src/sgml/syntax.sgml +++ b/doc/src/sgml/syntax.sgml @@ -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> |