Subject | Re: [firebird-support] Computed index |
---|---|
Author | Dmitry Kuzmenko |
Post date | 2013-10-09T12:41:15Z |
Hello, Tim!
Wednesday, October 9, 2013, 3:29:09 PM, you wrote:
TW> I've got a query containing
TW> ... WHERE ... (MYFIELD in (1,3,4,5,7,8,9,11,12,13))
TW> which runs horribly slowly, because (quite reasonably) the query
use
myfield+0 in (1,3,4,5,7,8,9,11,12,13)
so, it will not use index on myfield, and other indices can give
better performance.
--
Dmitry Kuzmenko, www.ib-aid.com
Wednesday, October 9, 2013, 3:29:09 PM, you wrote:
TW> I've got a query containing
TW> ... WHERE ... (MYFIELD in (1,3,4,5,7,8,9,11,12,13))
TW> which runs horribly slowly, because (quite reasonably) the query
use
myfield+0 in (1,3,4,5,7,8,9,11,12,13)
so, it will not use index on myfield, and other indices can give
better performance.
--
Dmitry Kuzmenko, www.ib-aid.com