From: Adarsh Sharma <adarsh.sharma@orkash.com>
To: Vitalii Tymchyshyn <tivv00@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Re-Reason of Slowness of Query
Date: Wed, 23 Mar 2011 15:40:12 +0530
Message-ID: <4D89C704.5080603@orkash.com> (raw)
In-Reply-To: <4D89BCD6.6040604@gmail.com>
References: <4D89BABF.4080806@orkash.com>
<4D89BCD6.6040604@gmail.com>
I just want to retrieve that id 's from page_content which do not have
any entry in clause2 table.
Thanks , Adarsh
Vitalii Tymchyshyn wrote:
> 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: adarsh.sharma@orkash.com, tivv00@gmail.com
Subject: Re: Re-Reason of Slowness of Query
In-Reply-To: <4D89C704.5080603@orkash.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox