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Re: DELETE FROM tableA WHERE NOT IN tableB ...

From: <kaiq(at)realtyideas(dot)com>
To: The Hermit Hacker <scrappy(at)hub(dot)org>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: DELETE FROM tableA WHERE NOT IN tableB ...
Date: 2000-04-18 14:15:58
Message-ID: Pine.LNX.4.10.10004180848520.29720-100000@picasso.realtyideas.com (view raw or flat)
Thread:
Lists: pgsql-sql
not tested:
delete from table_a         where not exists (select * from 
table_b where breferer = areferer)

tested:
select br_coid from brokers where not exists (select * from
coidinfo where c_coid = br_coid) 

Kai

On Tue, 18 Apr 2000, The Hermit Hacker
wrote
> 
> And now for todays trick question ...
> 
> have two tables, one of them is simple a string and a serial value, the
> second one is the serial value and more data ...
> 
> I want to clean out all records from tableB older then date (that is
> easy), then I want to clean out all values from tableB where there is no
> corresponding record in tableB ...
> 
> basically tableA's serial field is unique, but tableB's could have
> multiple records associated with. 
> 
> basically, what i've tried to do in a SELECT is something like:
> 
> SELECT referer_id 
>   FROM referer_data 
> EXCEPT 
>       SELECT distinct(referer_id) FROM referer_link;
> 
> But after 15 minutes, that's still running, so obviously that won't work ...
> 
> I can do it "in perl", but would love to come up with a nice, elegant, 'in
> server' method of doing this instead :)
> 
> Thanks...
> 
> Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
> Systems Administrator @ hub.org 
> primary: scrappy(at)hub(dot)org           secondary: scrappy(at){freebsd|postgresql}.org 
> 


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Subject: One query for two information...
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Subject: RE: DELETE FROM tableA WHERE NOT IN tableB ...

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