HALIL DEMIREZEN wrote: > Hi, > > I am trying to run an sql query such as below to list items=x randomly and > then items != x randomly.. > > > mysql> (select * from tablea where item=1 order by rand()) union all > (select * from tablea where item != 1 order by rand()); > > but the result is not as expected. rand() seems not to be working... > > What can be the problem? or what can be the difference between my will and > the exact result of the query?
Gleb Paharenko wrote: > Hello. > >>From http://dev.mysql.com/doc/refman/5.0/en/union.html: > > "ORDER BY for individual SELECT statements within parentheses has an > effect only when combined with LIMIT. Otherwise, the ORDER BY is > optimized away." > > Therefore you're getting the same results, because ORDER BY doen't > work for your query. HALIL DEMIREZEN wrote:
What if i want to list all the records not limiting them to a constant?
How about SELECT * FROM tablea ORDER BY (item != 1), RAND(); Michael -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
