Hi,
(this is not a real world problem, just something I'm playing around with).
Lately I had some queries of the form:
select t.*
from some_table t
where t.id not in (select some_id from some_other_table);
I could improve the performance of them drastically by changing the NOT NULL
On Thu, Jul 19, 2012 at 4:43 PM, Thomas Kellerer spam_ea...@gmx.net wrote:
delete from some_table
where id not in (select min(id)
from some_table
group by col1, col2
having count(*) 1);
(It's the usual - at least for me -
Thomas Kellerer spam_ea...@gmx.net writes:
Lately I had some queries of the form:
select t.*
from some_table t
where t.id not in (select some_id from some_other_table);
I could improve the performance of them drastically by changing the NOT NULL
into an outer join:
