The Add command is only available when you are creating a query using the prompted or diagram interfaces. The options that are available depend on the elements of the query that you are creating. The Add options are:
Use this option to add a table to the query.
Use this option to specify the type of join condition that will be applied when you are using multiple tables in the query.
Use this option to add a column or column expression to the query.
Use this option to add a sort condition that will control how information is sorted in the results of the query.
Use this option to add a row condition that will control how many rows can be returned in the results of the query.