Hello everybody can someone explain to me how to use expressions in the queries? I have a query in which from the table education i have to obtain 2 information 1)if they are certifier of security 2) their educational qualification . I import 2 times the table education in Structure then i use the parameter to be sure "*security" or "certifier of security" then my teacher uses the expression <>[education.Description] in the table education 1 which is a duplicate of education,to get their educational qualification ... can someone explain to me why he does like that? sorry for my english i'm from Italy![]()