Re: UPDATE w/ subselect doing locking

On 15 Nov 2001 at 12:12 (-0500), David Ford wrote:
| Yes, I know that works.  I want to figure out how to use SELECT ... FOR
| UPDATE with UPDATE because I will have a need to lock these certain rows
| and do a bit more than just 'count'.

AFAIK, you need to do the following the use the SELECT ... FOR UPDATE

 BEGIN;
  SELECT ... FOR UPDATE;
  UPDATE ... SET ...;
 COMMIT;

Any other session attempting an update on the selected for update rows
will block on the locked rows until the end of that xact.

hth.
  brent

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