When you select an element for your expression from a drop-down list, it is automatically inserted into the expression at the cursor.
Type an expression
You can type your expression directly into this box or build the expression from the dialog box drop-down lists.
Columns
Choose a column (for example record fields).
Operators
Choose an operator (such as +, -, and, or).
Functions
Functions (such as Area, Sin, Year) have zero or more parameters and return a value. The returned value may be used in an expression, such as another function.
Verify
Checks the syntax of the query and tells you whether it is correct.
Navigation Buttons
Cancel
Cancels the expression and removes the dialog box.
OK
Enters the expression and returns you to the Select dialog box.