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Re: Why aren't these queries the same?

From: santosh sharma <santysharma_at_yahoo.com>
Date: Wed, 6 Mar 2002 16:03:06 -0800
Message-ID: <a66aur$bep00$1@ID-84096.news.dfncis.de>


I think,
where mod_date < (sysdate - 12)
should be
where mod_date <= (sysdate - 12)

"Ed Stevens" <Ed_Stevens_at_nospam.noway.nohow> wrote in message news:3c86991a.207611960_at_ausnews.austin.ibm.com...
> I'm going through a process of identifying our biggest I/O hogs and
working with
> the devleopers to fix them. One statement has us stumped. The original
looks
> like this
>
> select count(*)
> from scott.table_a
> where (trunc(sysdate) - trunc(scott.table_a.mod_date) >= 12)
> /
>
> so what they are looking for are instances of mod_date that are 12 or more
days
> old.
>
>
> We re-wrote the query to look like this
>
> select count(*)
> from scott.table_a
> where mod_date < (sysdate - 12)
> /
>
> but they don't return the same results.
>
> I did confirm that trunc(sysdate) returned the same value as sysdate and
> trunc(scott.table_a.mod_date) returned the same value as
scott.table_a.mod_date.
>
>
> --
> Ed Stevens
> (Opinions expressed do not necessarily represent those of my employer.)
Received on Wed Mar 06 2002 - 18:03:06 CST

Original text of this message

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