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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/comment.sgml,v 1.3 1999/10/26 16:36:28 momjian Exp $
Postgres documentation
-->
<refentry id="SQL-COMMENT">
<refmeta>
<refentrytitle id="SQL-COMMENT-TITLE">
COMMENT
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
COMMENT
</refname>
<refpurpose>
Add comment to an object
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
COMMENT ON
[
[ DATABASE | INDEX | RULE | SEQUENCE | TABLE | TYPE | VIEW ]
<replaceable class="PARAMETER">object_name</replaceable> |
COLUMN <replaceable class="PARAMETER">table_name</replaceable>.<replaceable class="PARAMETER">column_name</replaceable>|
AGGREGATE <replaceable class="PARAMETER">agg_name</replaceable> <replaceable class="PARAMETER">agg_type</replaceable>|
FUNCTION <replaceable class="PARAMETER">func_name</replaceable> (<replaceable class="PARAMETER">arg1</replaceable>, <replaceable class="PARAMETER">arg2</replaceable>, ...)|
OPERATOR <replaceable class="PARAMETER">op</replaceable> (<replaceable class="PARAMETER">leftoperand_type</replaceable> <replaceable class="PARAMETER">rightoperand_type</replaceable>) |
TRIGGER <replaceable class="PARAMETER">trigger_name</replaceable> ON <replaceable class="PARAMETER">table_name</replaceable>
] IS <replaceable class="PARAMETER">'text'</replaceable>
</synopsis>
<refsect2 id="R2-SQL-COMMENT-1">
<refsect2info>
<date>1999-10-25</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">object_name, table_name,
column_name, agg_name, func_name, op, trigger_name</replaceable></term>
<listitem>
<para>
The name of the object to be be commented.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">text</replaceable></term>
<listitem>
<para>
The comment to add.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-COMMENT-2">
<refsect2info>
<date>1998-09-08</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
COMMENT
</computeroutput></term>
<listitem>
<para>
Message returned if the table is successfully commented.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-COMMENT-1">
<refsect1info>
<date>1998-10-25</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>COMMENT</command> adds a comment to an object that can be
easily retrieved with <application>psql's</application>
<emphasize>\dd</emphasize> command.
To remove a comment, use <literal>NULL</literal>.
Comments are automatically dropped when the object is dropped.
</para>
</refsect1>
<refsect1 id="R1-SQL-COMMENT-2">
<title>
Usage
</title>
<para>
Comment the table <literal>mytable</literal>:
<programlisting>
COMMENT ON mytable IS 'This is my table.';
</programlisting>
</para>
<para>
Some more examples:
<programlisting>
COMMENT ON DATABASE my_database IS 'Development Database';
COMMENT ON INDEX my_index IS 'Enforces uniqueness on employee id';
COMMENT ON RULE my_rule IS 'Logs UPDATES of employee records';
COMMENT ON SEQUENCE my_sequence IS 'Used to generate primary keys';
COMMENT ON TABLE my_table IS 'Employee Information';
COMMENT ON TYPE my_type IS 'Complex Number support';
COMMENT ON VIEW my_view IS 'View of departmental costs';
COMMENT ON COLUMN my_table.my_field IS 'Employee ID number';
COMMENT ON AGGREGATE my_aggregate float8 IS 'Computes sample variance';
COMMENT ON FUNCTION my_function (datetime) IS 'Returns Roman Numeral';
COMMENT ON OPERATOR ^ (text, text) IS 'Performs intersection of two text';
COMMENT ON TRIGGER my_trigger ON my_table IS 'Used for R.I.';
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-COMMENT-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-COMMENT-4">
<refsect2info>
<date>1998-09-08</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>COMMENT</command> in <acronym>SQL92</acronym>.
</para>
</refsect2>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
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sgml-indent-step:1
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sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
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sgml-local-ecat-files:nil
End:
-->
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