2. The database query system of claim 1 wherein said QAES includes: a storage system for maintaining state information about the current state of a database query; and a query expert logic system specifying to said QAUI said selectable sets by analyzing said state information maintained in said storage system and said conceptual information stored by said conceptual layer manager.
2. The database query system of claim 1 wherein said QAES includes: a storage system for maintaining state information about the current state of a database query; and a query expert logic system specifying to said QAUI said selectable sets by analyzing said state information maintained in said storage system and said conceptual information stored by said conceptual layer manager. 8. A database query system according to claim 2 wherein said conceptual information further comprises table join expression for non-equijoins.