RE: [PHP] Random PostreSQL
| From: | Christopher Thompson | Date: | Tue, 01 Aug 2000 21:00:59 +0000 |
| Subject: | RE: [PHP] Random PostreSQL | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-9553@lists.php.net to get a copy of this message | ||
A couple of ideas, but it really depends on how many you want:
- If you had an autonumber key you could fill an array with random numbers
and then select those records.
- Pick a random start record and use LIMIT to select the number of records
you want from that point. You could make this more random by picking a
different column to ORDER BY each time.
> -----Original Message-----
> From: Christensen, BruceX R [mailto:brucex.r.christensen@intel.com]
> Sent: Tuesday, August 01, 2000 1:31 PM
> To: 'joe@jWebMedia.com'; PHP mailing list (E-mail)
> Subject: RE: [PHP] Random PostreSQL
>
>
> I really doubt that's possible. If the table's small enough, you
> could just
> grab all of the rows in your SELECT query, but only actually use some of
> them. If it's very large (but each row has a sequential number,
> such as an
> auto-incrementing primary key [in which case it's important that
> no records
> have been deleted from the middle of the series of primary
> keys]), you could
> find out how many rows there are in the table, then do something
> like SELECT
> * FROM table WHERE id=rand1 OR id=rand2, etc, where rand1 and rand2 are
> random numbers you've generated that are between the lowest and highest
> primary key.
>
> --Bruce
>
> Bruce Christensen
> Intel Corporation
> brucex.r.christensen@intel.com
>
>
> -----Original Message-----
> From: joe@jWebMedia.com [mailto:joe@jWebMedia.com]
> Sent: Tuesday, August 01, 2000 1:26 PM
> To: php-general@lists.php.net
> Subject: [PHP] Random PostreSQL
>
>
> Anyone know of a simple way to select a random group of records from
> postgeSQL? Can't find anything in the manual that is of any help to me.
> Thanks,
>
> Joe
>
>
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