You may find that the query you first design does not meet your requirements. Fortunately, queries are easy to edit if you know how.
Adding or deleting Access Table
You can add a table to a query by redisplaying the Show Table dialog box and adding the new table. Click the Show Table button
to display the Show Table dialog box.
You can move tables boxes around the table pane in the same way that you can move table boxes in the Relationships window--just click the title bar of the box and drag the table to where you want it to appear.
Adding a field
You can add a field to the query in the same way that you originally added fields. Just double-click the field name in the top pane.
Alternatively, you can click and drag the field to exactly where you want to put it in the query grid--all the fields to the right of the new field will move one column to the right to make space.
Changing column width
You can change the width of any column in the design grid using the same method you learned to change column widths in Datasheet view.
Changing Column Width Datasheet View
Move the pointer to the right side of the column selector--the gray box at the top of the column--then click and drag the column divider until the column is the right size.
Moving a column in the query design grid is similar to moving a column in a datasheet. First select the column by clicking the column
selector, the gray box at the top of the column--then click the column selector again and drag the column to its new position.
To delete a column from the query design grid first select the column by clicking the column selector, then press the Delete key on your keyboard. Learn about limiting the results of your query by using criteria.