Ühel kenal päeval, R, 2007-03-02 kell 10:13, kirjutas Tom Lane: > Andrew Dunstan <[EMAIL PROTECTED]> writes: > > My instinct would be to follow your first strategy, i.e. detect which > > path is needed rather than try one and then if it fails do the other. > > The very first thing you need to think about is how to solve the race > condition problem, ie, two backends concurrently trying to insert > identical data.
Then one of them will update the data inserted by whoeved got the insert first. > Until you have a plausible mechanism for that, the > whole thing is pie-in-the-sky. Is'nt the standard way of doing it thus: UPDATE IF NOT FOUND THEN INSERT IF DUPLICATE KEY THEN UPDATE END IF END IF At least this is how UPSERT is usually done in plpgsql -- ---------------- Hannu Krosing Database Architect Skype Technologies OÜ Akadeemia tee 21 F, Tallinn, 12618, Estonia Skype me: callto:hkrosing Get Skype for free: http://www.skype.com ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match