Add a list Where Clause to restrict the values that display in a list box or combo box.
Refer to Add List Boxes and Combo Boxes for general information.
To create a List Where Clause:
Click Edit.
Click the Advanced Properties tab.
Enter the WHERE clause in the List Where Clause field.
Click Save.
Note
For nvarchar and nchar database fields, the N must be prepended to string literals in Where Clauses so Unicode characters will not be lost and the value must have single quotes on either side. This is unnecessary for numeric fields.s