Re: Left Join 3 tables - Mailing list pgsql-sql

From David W Noon
Subject Re: Left Join 3 tables
Date
Msg-id rsacp-4oi.ln1@my-pc.ntlworld.com
Whole thread Raw
In response to Left Join 3 tables  (dave_h4@yahoo.com (Hunter))
List pgsql-sql
On Wednesday 14 May 2003 18:35 in
<27ad91d2.0305140935.4fdec226@posting.google.com>, Hunter
(dave_h4@yahoo.com) wrote:

> 4) I need my query to:
>   a) count all rows where cust_id is in table A but *not* in table B
> AND *not* in table C

SELECT COUNT(*) FROM A  WHERE NOT EXISTS(SELECT 1 FROM B WHERE B.cust_id = A.cust_id)    AND NOT EXISTS(SELECT 1 FROM C
WHEREC.cust_id = A.cust_id);
 

>   b) display all emails where cust_id is in table A but *not* in table
> B AND *not* in table C

SELECT A.email FROM A  WHERE NOT EXISTS(SELECT 1 FROM B WHERE B.cust_id = A.cust_id)    AND NOT EXISTS(SELECT 1 FROM C
WHEREC.cust_id = A.cust_id);
 

-- 
Regards,

Dave
======================================================
dwnoon@spamtrap.ntlworld.com (David W Noon)
Remove spam trap to reply via e-mail.
======================================================


pgsql-sql by date:

Previous
From: Didrik Pinte
Date:
Subject: Re: bad query performance
Next
From: Issa
Date:
Subject: Inquiry From Form [pgsql]