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Re: SQL With Dates

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Rafael Domiciano <rafael(dot)domiciano(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: SQL With Dates
Date: 2009-04-20 18:59:12
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Mon, Apr 20, 2009 at 7:55 AM, Rafael Domiciano
<rafael(dot)domiciano(at)gmail(dot)com> wrote:
> Hello People,
> I have initiated a work to review the sqls of our internal software.
> Lot of them he problem are about sql logic, or join with table unecessary,
> and so on.
> But software has lot of sql with date, doing thinks like:
> [..]
>   date >= '2009-04-01' AND
>   date <= '2009-04-15'
> [..]
> Redoing the SQL with fix date (date = '2009-04-01') o cost in explain always
> still about 200 or less. But with a period the cost is high, about 6000 or
> more.

Yep.  Because you'll be getting more rows. More rows == more cost.  TANSTAAFL.

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pgsql-performance by date

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Subject: Re: SQL With Dates
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