Click anywhere in the table to show letters above the columns and numbers to the left of the rows. Then do any of the following:
Select a single row or column: Click the number or letter for the row or column you want to select.
Select multiple rows or columns: Click the number or letter for a row or column, then drag a selection handle (a white square) to encompass the rows or columns you want.
Select nonadjacent rows or columns: Command-click the numbers or letters for the rows or columns you want to select.