The Field selector contains all individual columns for the selected tables, plus a special choice ending with an asterisk (*) for each table, which means all the fields are selected:

To display all the fields in the author table, we choose `author`.* and check the Show checkbox, without entering anything in the Sort and Criteria boxes. In our case, we select `author`.`name`, because we want to enter some criteria for the author's name.

For each selected individual column, we can specify a sort (in Ascending or Descending order) or let this line remain intact (meaning no sort). If we choose more than one sorted column, the sort will be done with a priority from left to right.