> Hello, I am running MySQL5.0.0 on my OpenBSD system. When I excute this > query I get 153 hits. > > SELECT b.batch_id, b.date, b.creator, b.comments FROM cd_batch as b; > > But when I add this table to the where clause i get 5831 hits > > SELECT b.batch_id, b.date, b.creator, b.comments FROM cd_batch as b, > cd_donor as d; > > Why does this happend? I thought that these two queries would return the > exact same amout of rows. Is there something I have forgotten or is the > debug release of 5.x.x errornous?
This is expected behaviour. It's called a cathesian product and it returns records_b x records_d number of rows. You might find this of help http://www.w3schools.com/sql/sql_join.asp Regards, <mack /> -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
