Privet!
> What is faster: UNION or temporary table or something else ? Sometimes MERGE tables could be used, but the speed difference between UNION solution and MERGE is rather low. The temporary table for sorting (ORDER clause causes this) should be created in all cases. So, if you have to reuse data returned from the query several times, create a temporary table from results. BTW - what query (queries) are you going to use for sorting data from several tables? I see simple subquery like: create temporary table t1 select a from ( select a from d1 union select a from d2 ) as foo order by a; If you have faster solution (in several times) please introduce it. I've seen similar issues at archives at: http://lists.mysql.com/mysql odnako, I haven't found an exact answer. :) íÉÈÁÉÌ íÏÎÁÛ£× <[EMAIL PROTECTED]> wrote: > Hello, > > I have 10 tables: > table0: id, description, date > table2: id, description, date > ... > table9: id, description, date > > Every table has 1 000 000 rows. > > How can I select all rows from this 10 tables ordered by date? > What is faster: UNION or temporary table or something else ? > > mysql 4.1 > > Sincerely, > Michael, > http://xoib.com/ http://3d2f.com/ > http://qaix.com/ http://ryxi.com/ > http://gyxe.com/ http://gyxu.com/ > http://xywe.com/ http://xyqe.com/ > > -- For technical support contracts, goto https://order.mysql.com/?ref=ensita This email is sponsored by Ensita.NET http://www.ensita.net/ __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Gleb Paharenko / /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED] /_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.NET <___/ www.mysql.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]