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| author | Bruce Momjian <bruce@momjian.us> | 2011-09-06 13:41:30 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2011-09-06 13:42:04 -0400 |
| commit | 94bf47db8ffc13005d9b14ec3331f6db94a91d46 (patch) | |
| tree | 24adcada4cc8543cb76d707f67fcb63c2f28aa59 | |
| parent | a3850a5f7582ebe328d2506873e31aac2b01d51b (diff) | |
| download | postgresql-94bf47db8ffc13005d9b14ec3331f6db94a91d46.tar.gz | |
Document PERFORM limitation when using WITH queries.
Backpatch to 9.0 and 9.1.
Report from depstein@alliedtesting.com.
| -rw-r--r-- | doc/src/sgml/plpgsql.sgml | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/src/sgml/plpgsql.sgml b/doc/src/sgml/plpgsql.sgml index 20bc991083..76fa78c8ec 100644 --- a/doc/src/sgml/plpgsql.sgml +++ b/doc/src/sgml/plpgsql.sgml @@ -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 |