hi…experts
I have one doubt i have two tables logisticspostal address(standard) table and vendortable(i created)
so requirement is to give validation in logisticspostal address table based on vendortable records. if i enter new user name ,ifthat user name already exists it will show already exists other wise it will insert.if user name are same their address is different it is allow to insert. for this requirement how can i write select statement
please suggest me