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+$PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.96 2005/01/14 21:46:09 jurka Exp $
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<sect1 id="xfunc">
<primary>volatility</primary>
<secondary>functions</secondary>
</indexterm>
+ <indexterm zone="xfunc-volatility">
+ <primary>VOLATILE</primary>
+ </indexterm>
+ <indexterm zone="xfunc-volatility">
+ <primary>STABLE</primary>
+ </indexterm>
+ <indexterm zone="xfunc-volatility">
+ <primary>IMMUTABLE</primary>
+ </indexterm>
<para>
Every function has a <firstterm>volatility</> classification, with