The method for evaluating algebraic equations is properly done through the use of reverse polish notation or more formally known as postfix notation. (It's referred to a reverse Polish notation because a Polish fellow figured it out) I've written these programs in COBOL, never thought about doing it in in T-SQL, maybe VB.NET. Could be a challenge. Through the use of cursors it might not be that difficult. I'll see if I can come up with something in a few days. You can use this method with a few modifications to evaluate formal logic as well. i.e is (A > B) or (C > B & D = B) a true statement. That can get very complex, trust me. So can algebra.