From: | Joseph Shraibman <jks(at)selectacast(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-sql <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: exists |
Date: | 2001-08-22 00:15:45 |
Message-ID: | 3B82F9B1.6020401@selectacast.net |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
I'm running 7.1.3. What does 'rows=10000' mean? The number of rows returned or the
number postgres has to look through?
Tom Lane wrote:
> Joseph Shraibman <jks(at)selectacast(dot)net> writes:
>
>>Why does explain show more than one row, even if there is a LIMIT = 1?
>>
>
> What version are you running? I get results like
>
> regression=# explain select * from tenk1 limit 1;
> NOTICE: QUERY PLAN:
>
> Limit (cost=0.00..0.03 rows=1 width=148)
> -> Seq Scan on tenk1 (cost=0.00..333.00 rows=10000 width=148)
>
> EXPLAIN
>
> which seems at least moderately self-explanatory.
>
> regards, tom lane
>
--
Joseph Shraibman
jks(at)selectacast(dot)net
Increase signal to noise ratio. http://www.targabot.com
From | Date | Subject | |
---|---|---|---|
Next Message | Jayson Callaway | 2001-08-22 04:23:54 | changes to table creation syntax in 7.1.2? |
Previous Message | Tom Lane | 2001-08-21 23:48:34 | Re: exists |