From: | Melvin Davidson <melvin6925(at)gmail(dot)com> |
---|---|
To: | Tom Smith <tomsmith1989sk(at)gmail(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: fastes way to retrieve segmented without using loop |
Date: | 2015-08-23 21:38:44 |
Message-ID: | CANu8FiyRkBAwtMGj-=YUc4uJEmMyo0HvrWO9bqVUHr4Er7GKXQ@mail.gmail.com |
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Lists: | pgsql-general |
Well, I would say the following might work:
SELECT *
FROM table
WHERE t >=1
LIMIT 99998;
On Sun, Aug 23, 2015 at 5:05 PM, Tom Smith <tomsmith1989sk(at)gmail(dot)com> wrote:
> Hello:
>
> I have a time series table,
> using below sql, loop (psque code), I can get one row for each hour
>
> for( H=1: H< 99999; H++){
> select * from table where t >= H and t < H+1 limit 1
> }
>
> t (time column) is indexed).
>
> Is there a better way to use a issue a SINGLE SQL
> with an array of time start/end pair
> so it will be executed once to send back result, which would be much faster
> than issuing sql again and again (even with prepared statement and using
> sql function).
>
> Thanks in Advance
>
--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
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