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Clarify what commands are not allowed in SQL functions.

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This commit is contained in:
Bruce Momjian 2011-03-10 18:46:21 -05:00
parent 9d4625ad0b
commit 678a0d286c
1 changed files with 3 additions and 3 deletions
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6
doc/src/sgml/xfunc.sgml
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@ -116,9 +116,9 @@
Besides <command>SELECT</command> queries, the commands can include data
modification queries (<command>INSERT</command>,
<command>UPDATE</command>, and <command>DELETE</command>), as well as
other SQL commands. (The only exception is that you cannot put
<command>BEGIN</>, <command>COMMIT</>, <command>ROLLBACK</>, or
<command>SAVEPOINT</> commands into a <acronym>SQL</acronym> function.)
other SQL commands. (You cannot put transaction commands, e.g.
<command>COMMIT</>, <command>SAVEPOINT</>, and some utility
commands, e.g. <literal>VACUUM</>, into an <acronym>SQL</acronym> function.)
However, the final command
must be a <command>SELECT</command> or have a <literal>RETURNING</>
clause that returns whatever is