> -----Original Message-----
> From: Chris [mailto:[EMAIL PROTECTED]
> Sent: maandag 14 augustus 2006 3:55
> To: Mark
> Cc: [email protected]
> Subject: Re: Random SELECT on subset
>
> > In Perl, I'm trying to get 4 random entries from a subset
> > "WHERE processed
> > = '1'" and "columnId" is unique. Like so:
> >
> > $sth = $dbh->prepare ("SELECT columnId FROM queue WHERE
> > columnId >= (SELECT FLOOR(MAX(columnId) * RAND()) FROM
> > queue) IN
> (SELECT columnId FROM
> > queue WHERE processed = '1') ORDER BY columnId LIMIT 4");
>
> I'm not even sure what you're trying to get here!
>
> Could you provide some sample data (5 rows) and what you want
> the query to return?
Well, there are a great many colums in the real rows, but say they are like
this:
columnID, picturename, processed, ....
1 name1 1
2 name2 0
3 name3 1
4 name4 1
5 name5 1
6 name6 0
7 name7 1
Then I want to select 4 random columnIDs, but only from the subset
WHERE processed = '1' (so, from the group 1,3,4,5,7).
Thanks. I appreciate your help.
- Mark
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