Hi Pavel,
That is what I've done in this particular case but there are parts where
I use exist checks in this way that are very cumbersome to write out
like that so I'm hoping there is a way to make the optimizer work with
existence checks in this way.
Cheers,
Bastiaan Olij
On 19/02/13 6:39
Hi All,
Hope someone can help me a little bit here:
I've got a query like the following:
--
select Column1, Column2, Column3
from Table1
where exists (select 1 from Table2 where Table2.ForeignKey =
Table1.PrimaryKey)
or exists (select 1 from Table3 where Table3.ForeignKey = Table1.PrimaryKey)
--
Limit the sub-queries to 1, i.e. :
select 1 from Table2 where Table2.ForeignKey = Table1.PrimaryKey fetch first 1
rows only
Andy.
On 19.02.2013 07:34, Bastiaan Olij wrote:
Hi All,
Hope someone can help me a little bit here:
I've got a query like the following:
--
select Column1, Column2,
Hi Andy,
I've tried that with the same result. One subquery works beautifully,
two subqueries with an OR and it starts to do a sequential scan...
Thanks,
Bastiaan Olij
On 19/02/13 6:31 PM, Andy wrote:
Limit the sub-queries to 1, i.e. :
select 1 from Table2 where Table2.ForeignKey =
2013/2/19 Bastiaan Olij basti...@basenlily.me:
Hi Andy,
I've tried that with the same result. One subquery works beautifully,
two subqueries with an OR and it starts to do a sequential scan...
try to rewrite OR to two SELECTs joined by UNION ALL
Pavel
Thanks,
Bastiaan Olij
On 19/02/13
