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Document PERFORM limitation when using WITH queries.

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Backpatch to 9.0 and 9.1.

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Bruce Momjian 2011-09-06 13:41:28 -04:00
parent ae92eff6b9
commit 6f94280dee
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doc/src/sgml/plpgsql.sgml
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@ -940,6 +940,9 @@ PERFORM <replaceable>query</replaceable>;
result. Write the <replaceable>query</replaceable> the same
way you would write an SQL <command>SELECT</> command, but replace the
initial keyword <command>SELECT</> with <command>PERFORM</command>.
For <keyword>WITH</> queries, use <keyword>PERFORM</> and then
place the query in parentheses. (In this case, the query can only
return one row.)
<application>PL/pgSQL</application> variables will be
substituted into the query just as for commands that return no result,
and the plan is cached in the same way. Also, the special variable