select entire rows or columns
Tap 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: Tap the number or letter for the row or column.
Select multiple adjacent rows or columns: Tap the number or letter for a row or column, then drag a blue dot across the adjacent rows or columns.
Select non-adjacent rows or columns: Tap the number or letter for a row or column, tap Select Cells, then tap more rows or columns and drag a blue dot across the cells you want to select (or tap Select All to select all cells in the table). When you’ve finished selecting, tap Done.