Re: Substract queries
Thanks to all the EXEPT keyword is what I was looking for
On Thu, May 22, 2008 at 5:36 PM, Niklas Johansson <
spot(at)tele2(dot)se> wrote:
On 22 maj 2008, at 17.15, Nacef LABIDI wrote:
I was wondering how can I substract result between select queries. I mean I want to issue a query that does this :
(select * from mytable where condition1) - (select * from mytable where condition2)
If you (as implied above) query the same table in both cases, just do:
SELECT * FROM mytable WHERE condition1 AND NOT condition2
Otherwise, use EXCEPT:
SELECT * FROM mytable1 WHERE condition1
EXCEPT
SELECT * FROM mytable2 WHERE condition2
in which case both queries must return the same type of rows.
Sincerely,
Niklas Johansson
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