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Left Join 3 tables 2+ messages / 2 participants [nested] [flat]
* Left Join 3 tables @ 2003-05-14 17:35 Hunter <dave_h4@yahoo.com> 0 siblings, 1 reply; 2+ messages in thread From: dave_h4@yahoo.com @ 2003-05-14 17:35 UTC (permalink / raw) To: pgsql-sql Hi Group - 1) I have 3 tables: A, B and C 2) Each table has an unqiue associative field called cust_id 3) The cust_id HAS to be in table A, the cust_id *could* be in table B, and the cust_id *could* be in table C 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 b) display all emails where cust_id is in table A but *not* in table B AND *not* in table C Here's some of my queries of what I have: This one is close I think: select distinct A.email from A left join A as ics on ics.custid = A.custid left join B on B.custid = A.custid left join C on C.custid = A.custid where ics.custid <> A.custid; THANK YOU! dave ^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Left Join 3 tables @ 2003-05-15 11:39 David W Noon <dwnoon@spamtrap.ntlworld.com> parent: Hunter <dave_h4@yahoo.com> 0 siblings, 0 replies; 2+ messages in thread From: David W Noon @ 2003-05-15 11:39 UTC (permalink / raw) To: 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 WHERE C.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 WHERE C.cust_id = A.cust_id); -- Regards, Dave ====================================================== dwnoon@spamtrap.ntlworld.com (David W Noon) Remove spam trap to reply via e-mail. ====================================================== ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2003-05-15 11:39 UTC | newest] Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2003-05-14 17:35 Left Join 3 tables Hunter <dave_h4@yahoo.com> 2003-05-15 11:39 ` David W Noon <dwnoon@spamtrap.ntlworld.com>
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