Simon Riggs wrote:
I'm a bit surprised the TODO didn't mention the MERGE statement, which
is the SQL:2003 syntax for specifying this as an atomic statement.


http://archives.postgresql.org/pgsql-hackers/2004-05/thrd5.php#00497

There is a thread there entitled "Adding MERGE to the TODO list"

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TIP 9: In versions below 8.0, the planner will ignore your desire to
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