From: Vitalii Tymchyshyn <tivv00@gmail.com>
To: Adarsh Sharma <adarsh.sharma@orkash.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Re-Reason of Slowness of Query
Date: Wed, 23 Mar 2011 11:26:46 +0200
Message-ID: <4D89BCD6.6040604@gmail.com> (raw)
In-Reply-To: <4D89BABF.4080806@orkash.com>
References: <4D89BABF.4080806@orkash.com>
23.03.11 11:17, Adarsh Sharma ???????(??):
>
> I think it is very much faster but I don't understand the query :
>
> *explain select distinct(b) from t1,t2 where t1.b >t2.d union all
> select distinct(b) from t1,t2 where t1.b <t2.d;
> *
I don't understand it too. What are you trying to get? Is it
select distinct(b) from t1 where b > (select min(d) from t2)**or b <
(select max(d) from t2)
?
Can you explain in words, not SQL, what do you expect do retrieve?
Best regards, Vitalii Tymchyshyn
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To: pgsql-performance@postgresql.org
Cc: tivv00@gmail.com, adarsh.sharma@orkash.com
Subject: Re: Re-Reason of Slowness of Query
In-Reply-To: <4D89BCD6.6040604@gmail.com>
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