Re: Query optimisation - Mailing list pgsql-general

From Craig Ringer
Subject Re: Query optimisation
Date
Msg-id 47F9A67A.9090903@postnewspapers.com.au
Whole thread Raw
In response to Query optimisation  (Naz Gassiep <naz@mira.net>)
Responses Re: Query optimisation
Re: Query optimisation
List pgsql-general
Naz Gassiep wrote:

>                 JOIN files imageid_file ON (images.imageid =
> imageid_file.fileid)
>                 JOIN files size120_file ON (images.size120 =
> size120_file.fileid)
>                 JOIN files size240_file ON (images.size240 =
> size240_file.fileid)
>                 JOIN files size420_file ON (images.size420 =
> size420_file.fileid)
>                 JOIN files size600_file ON (images.size600 =
> size600_file.fileid)
>                 JOIN files size800_file ON (images.size800 =
> size800_file.fileid)
>                 JOIN files size1024_file ON (images.size1024 =
> size1024_file.fileid)
>                 JOIN files size130sq_file ON (images.size130sq =
> size130sq_file.fileid)
>                 JOIN files size240sq_file ON (images.size240sq =
> size240sq_file.fileid)
>                 JOIN files size420sq_file ON (images.size420sq =
> size420sq_file.fileid)
>                 JOIN images_sites ON (images_sites.imageid =
> images.imageid)

That's a whole lot of joins.

Do all those tables have the same fields? Can you unify them into one
table with an additional field like "imagesize" and use an appropriate
WHERE clause when looking up the table?

--
Craig Ringer

pgsql-general by date:

Previous
From: Tom Lane
Date:
Subject: Re: Removing Context messages
Next
From: Tom Lane
Date:
Subject: Re: Query optimisation