Getting records from one table not in another

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Getting records from one table not in another

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cemiess
Starting Member

1 Post

Posted - 2009-11-27 : 09:49:07

I've read a few ways of doing this, LEFT JOINs, UNIONs, NOT EXISTS and NOT INs, but none of them quite do what I need.

The problem is that in the tables I'm using, there is a "uid" that can exist multiple times, and that is what I'm comparing the tables on. There is a "mid" field that is unique, but it's only in the 1st table.

Also in the first table is a "list_" column, which provides normalisation of sorts, no 2 uids can have the same list_.

Needless to say this is not a database I made...

I'm quite new to sql, and this is providing a bit of a challenge for me, so any help would be greatly appreciated.

I need to do 2 queries, ie

All the records in table a but not in table b
and
All the records in table b but not in table a

Thanks in advance.

http://resourcebasedliving.com

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-11-27 : 22:19:19

seems like this


SELECT fields....
FROM TableA a
WHERE NOT EXISTS (SELECT 1 FROM TableB WHERE uid =a.uid) 
UNION ALL
SELECT fields....
FROM TableB b
WHERE NOT EXISTS (SELECT 1 FROM TableA WHERE uid =b.uid)

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