Re: update with from - Mailing list pgsql-general

From Adrian Klaver
Subject Re: update with from
Date
Msg-id 201201230910.20127.adrian.klaver@gmail.com
Whole thread Raw
In response to Re: update with from  (Sim Zacks <sim@compulab.co.il>)
Responses Re: update with from  (Sim Zacks <sim@compulab.co.il>)
List pgsql-general
On Monday, January 23, 2012 7:32:35 am Sim Zacks wrote:
> On 01/23/2012 05:13 PM, Adrian Klaver wrote:

>
> When I throw in code to make the select only return the correct rows
> The select statement takes 9 secs by itself:
> select a.partid,a.deliverywks
> from poparts a where popartid in (
>     select b.popartid from poparts b
>     join pos c using(poid)
>     join stock.lastrfqdateperpart d using(partid)
>     where c.isrfq and c.issuedate > d.issuedate-7
>     AND b.unitprice > 0::numeric AND b.quantity >= 100::numeric AND
> c.postatusid = ANY (ARRAY[40, 41])
>     and b.partid=a.partid
>     order by b.partid,b.unitprice, b.deliverywks
>     limit 1
> )

To clarify what I posted earlier, my suggestion was based on rewriting the
second query as:

        select b.partid,b.deliverywks b.popartid from poparts b
        join pos c using(poid)
        join stock.lastrfqdateperpart d using(partid)
        where c.isrfq and c.issuedate > d.issuedate-7
        AND b.unitprice > 0::numeric AND b.quantity >= 100::numeric AND
c.postatusid = ANY (ARRAY[40, 41])
        order by b.partid,b.unitprice, b.deliverywks
        limit 1

I may be missing the intent of your original query, but I think the above gets
to the same result without the IN.

--
Adrian Klaver
adrian.klaver@gmail.com

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