I was testing features of QGIS and its really cool.I tried to query each table using right click and query but I can't query sql server 2008 database :
Error: An error occured when executing the query. The data provider said: [microsoft][odbc sql server driver][sql server] invalid object name 'table_test' qodbc3:unable to execute statement
but it works fine with postgis. :Also is there any why to join table and do the query?