On Sat, 12 Feb 2011 22:40:27 +0200
Andre Polykanine <andre@xxxxxxxx> wrote:
> Hi all,
> I'm using in my PHP script the following four MySql queries:
> $q1=mysql_query("SELECT * FROM `CandidateQuestions` WHERE
> `Category`='1' ORDER BY RAND() LIMIT 1");
> $q2=mysql_query("SELECT * FROM `CandidateQuestions` WHERE
> `Category`='2' ORDER BY RAND() LIMIT 1");
> $q3=mysql_query("SELECT * FROM `CandidateQuestions` WHERE
> `Category`='3' ORDER BY RAND() LIMIT 1");
> $q4=mysql_query("SELECT * FROM `CandidateQuestions` WHERE
> `Category`='4' ORDER BY RAND() LIMIT 1");
>
> and here goes the question: is there a way to make these four in one
> so strictly one random question is selected from all of the four
> categories?
> Thanks!
select * from (select * from `CandidateQuestions` order by rand() ) t group by `Category`;
>
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--
Simcha Younger <simcha@xxxxxxxxxxxx>
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