From: | Ron Johnson <ron(dot)l(dot)johnson(at)cox(dot)net> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Union Query Improvement |
Date: | 2007-02-14 07:29:23 |
Message-ID: | 45D2BA53.2010100@cox.net |
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Thread: | |
Lists: | pgsql-general |
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On 02/13/07 07:46, Ray Bannon wrote:
> I have a query which is running a bit slowly, and I'm wondering if anyone
> has a design improvement. Basically it's a series of unions as follows:
>
> Select ID, plan_name from table/view
> Where plan_name = 'A'
> And rownum = 1
> UNION
> Select ID, plan_name from table/view
> Where plan_name = 'B'
> And rownum = 1
> UNION
> Select ID, plan_name from table/view
> Where plan_name = 'C'
> And rownum = 1
> UNION
>
> Ad infinitum for about 100 iterations.
>
> Any way to write this more efficiently?
Just out of curiosity: why does your(?) design have 100 tables/views
with the same (or almost identical) structure?
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