Choosing tables
The initial selection includes all tables. Consequently, the Column selector contains a great number of columns. For our example, we will work only with the author and the book tables. Hence, we select only these from the Use Tables selector.
We then click on the Update Query button. This refreshes the screen and reduces the number of columns available in the Column selector. We can always change the selected tables later, using our browser's mechanism for multiple choices in drop-down menus (usually control click).
