Bruno Wolff III wrote:
On Sun, Mar 04, 2007 at 14:55:47 +0200,
  Hannu Krosing <[EMAIL PROTECTED]> wrote:
UPDATE
IF NOT FOUND THEN
  INSERT
  IF DUPLICATE KEY THEN
    UPDATE
  END IF
END IF


I believe it is possible for the above to fail. For example another
transaction could create a matching record between the update and insert
and then another transaction could delete it between the insert and the
second update.

You know we have example in manual right ?
http://www.postgresql.org/docs/current/static/plpgsql-control-structures.html#PLPGSQL-UPSERT-EXAMPLE

:)

--
Regards
Petr Jelinek (PJMODOS)



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