From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | "Ingram, Bryan" <BIngram(at)sixtyfootspider(dot)com> |
Cc: | "'pgsql-sql(at)postgresql(dot)org'" <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Why is this doing a seq scan? |
Date: | 2000-11-17 21:39:53 |
Message-ID: | 14140.974497193@sss.pgh.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
"Ingram, Bryan" <BIngram(at)sixtyfootspider(dot)com> writes:
>> Also it would be useful to see the full declarations of the tables
>> and their indexes; I'm wondering what datatype the zip columns are,
>> for example.
> Table = atms
> | zip | text |
> Table = zips
> | zip | varchar() |
Ah, there's your problem --- the planner is not very smart about
optimizing cross-datatype comparisons. Make these columns both text,
or both varchar, and I'll bet you get a more intelligent plan.
Current sources (7.1-to-be) are a little smarter than 7.0 about
cross-data-type joins, but they still don't get this case right.
I have a TODO item about that, but I dunno if it'll get done before
7.1 ...
regards, tom lane
From | Date | Subject | |
---|---|---|---|
Next Message | clayton cottingham | 2000-11-17 21:45:37 | Re: is there a mysql to postgresql sql converter? |
Previous Message | Max Fonin | 2000-11-17 21:17:34 | Re: is there a mysql to postgresql sql converter? |