By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
464,835 Members | 1,094 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 464,835 IT Pros & Developers. It's quick & easy.

help with correlated delete and outer join

P: n/a

I'm using postgresl 7.3.2 and have a query that executes very slowly.

There are 2 tables: Item and LogEvent. ItemID (an int4) is the primary key
of Item, and is also a field in LogEvent. Some ItemIDs in LogEvent do not
correspond to ItemIDs in Item, and periodically we need to purge the
non-matching ItemIDs from LogEvent.

The query is:

delete from LogEvent where EventType != 'i' and ItemID in
(select distinct e.ItemID from LogEvent e left outer join Item i
on e.ItemID = i.ItemID where e.EventType != 'i' and i.ItemID is null);

I understand that using "in" is not very efficient.

Is there some other way to write this query without the "in"?

Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (
Version: 6.0.592 / Virus Database: 375 - Release Date: 2/18/2004
---------------------------(end of broadcast)---------------------------
TIP 1: subscribe and unsubscribe commands go to ma*******

Nov 23 '05 #1
Share this question for a faster answer!
Share on Google+

This discussion thread is closed

Replies have been disabled for this discussion.