Re: Update join performance issues

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On 04/03/2012 01:29 PM, Kevin Kempter wrote:
Hi All;

I have a query that wants to update a table based on a join like this:

update test_one
set f_key = t.f_key
from
    upd_temp1 t,
    test_one t2
where
    t.id_number = t2.id_number


Why is test_one in the from clause? update joins whatever is in the from clause to the table being updated. You almost never need it repeated in the from clause.


cheers

andrew




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