"Christopher Kings-Lynne" <[EMAIL PROTECTED]> writes: > I can't try the insert and then the update because the INSERT, in Postgres, > will cause an outright transaction failure.
Do the update, then try to insert if the update found nothing, and put a retry loop around the whole transaction in case you fail because of concurrent inserts. Realistically you will need a retry loop in all but the most trivial cases anyway --- certainly so if you want to use serializable transaction mode. So I don't think this solution is unworkably complex. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])