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Postgres documentation

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<para>

<command>COMMENT</command> adds a comment to an object that can be

easily retrieved with <application>psql's</application>

<emphasis>\dd</emphasis>, <emphasis>\d+</emphasis>, or <emphasis>\l+</emphasis>commands.

easily retrieved with <command>psql</command>'s

<command>\dd</command>, <command>\d+</command>, or <command>\l+</command>commands.

To remove a comment, use <literal>NULL</literal>.

Comments are automatically dropped when the object is dropped.

</para>