Re: Speed up the query
| От | Hengky Lie |
|---|---|
| Тема | Re: Speed up the query |
| Дата | |
| Msg-id | CADvRrxP-FZeJZc2pa=cHgm5BA6O4nkjxEwArF-MS=dVjiF1TVw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Speed up the query (Kevin Grittner <kgrittn@ymail.com>) |
| Список | pgsql-performance |
Thanks Kevin. You are absolutely right. I should use parentheses, it is what i want for the query to do.
It also increasing processing time to 5.444 seconds. Should be okay i think.On Sun, Dec 1, 2013 at 11:02 PM, Kevin Grittner <kgrittn@ymail.com> wrote:
Hengky Liwandouw <hengkyliwandouw@gmail.com> wrote:
> where jualid is not null
> and extract(year from tanggal)='2013')> But the problem is : when i change the where clause to :Before worrying about the run time, I would worry about whether you
>
> where jualid is not null or returjualid is not null
> and extract(year from tanggal)='2013')
>
> (there is additional or returjualid is not null,) the query needs
> 56 second to display the result.
are getting the results you expect. That will be interpreted as:or (returjualid is not null and extract(year from tanggal) = '2013')
where jualid is not null
... not:
where (jualid is not null or returjualid is not null)
and extract(year from tanggal) = '2013'
AND has higher priority than OR; so if you want to limit by year
from tanggal even when jualid is not null, you must use
parentheses.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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