Greeetings. I'm trying to come up with a way to allow one column to have the same value up to two times, but no more than two times. I attempted adding a constraint to check the count of the value in the field - count (trsqqq) <=2 but aggregate functions are not allowed in constraints. Is there another way to do this? Any help would be greatly appreciated. Thanks in advance. Dara
*--Dara J. Olson Unglaube* Aquatic Invasive Species Coordinator, Spatial Database Manager Great Lakes Indian Fish & Wildlife Commission P.O. Box 9, 72682 Maple Street Odanah, WI 54861 (715) 682-6619 ext.2129 d...@glifwc.org <dol...@glifwc.org> maps.glifwc.org