From: | Bjørn T Johansen <btj(at)havleik(dot)no> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Does not use index on query using "field is null"? |
Date: | 2010-11-10 12:07:49 |
Message-ID: | 20101110130749.14dff805@pennywise.asp-as.no |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
I have a query that looks like this...:
select * from table where field is null
And when I run explain, it tells me that it uses seq scan... Is this because pg thinks that seq scan is as fast as using indexes or because using index on "is null" queries does
not work?
Regards,
BTJ
--
-----------------------------------------------------------------------------------------------
Bjørn T Johansen
btj(at)havleik(dot)no
-----------------------------------------------------------------------------------------------
Someone wrote:
"I understand that if you play a Windows CD backwards you hear strange Satanic messages"
To which someone replied:
"It's even worse than that; play it forwards and it installs Windows"
-----------------------------------------------------------------------------------------------
From | Date | Subject | |
---|---|---|---|
Next Message | Vick Khera | 2010-11-10 13:35:04 | Re: Does not use index on query using "field is null"? |
Previous Message | Szymon Guz | 2010-11-10 09:33:53 | Re: Comments on tables |