This figure shows the Query Wizard Expression Builder dialog. It contains an Expression Builder text entry field with a Redo, Undo, and Delete button. There are four areas: Variables, Functions, Operands, and Function Description. The Variables area contains a pull-down menu and a Properties list. The Functions area contains a pull-down menu and Functions list. The Operands area contains a list of operands. The Function Description area contains a text entry field that provides the available signatures for the currently selected function.