You can create a query with an unnamed parameter by specifying a question mark (?) as a placeholder for a literal value. You can specify as many unnamed parameters in the query as you need.
Note If you are using multiple parameters, you can use named parameters to help you distinguish them. For details, see Creating a Query with Named Parameters.
When you run the query in the Query Designer, the Define Query Parameters dialog box is displayed with "?" as the name of the parameter.
To specify an unnamed parameter
By default, the Query Designer adds the "=" operator. However, you can edit the cell to substitute ">", "<", or any other SQL comparison operator.