On 12/01/2008 08:30 AM, Andrej Kastrin wrote: > I have the table 'test' which includes two columns: 'study' and 'symbol': > > study symbol > a2008 A > a2008 B > a2008 C > a2008 D > b2005 A > b2005 B > b2005 E > > > The task is to perform an intersection on 'name' column according to > all distinct values in 'study' column. During the experiments the > intersection was done 'manually' using the query: > > SELECT a.symbol FROM test as a, test as b WHERE a.symbol=b.symbol and > a.study="a2008" and b.study="b2005"; > > So the result of the query above is (A, B). > > The question is how to implement this query more automatically, > without directly referencing to the study names, because I want to > implement it into a php script. > > Thank you in advance for any suggestions. > > Best, Andrej > Why not:
SELECT a.symbol FROM test as a, test as b WHERE a.symbol=b.symbol and a.study != b.study group by symbol; -Micah -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
