Suppose you have a database with 60000 records and 250 fields, and want to copy this database in other sheet.
You may fail once again to select all this database (either because you lose the selected range, or you choose all but one column, etc.)
The solution? Use the Select Current Region tool, which works as follows:
Just put it on any cell in the database and click on the right button.
That's it: Select Current Region selects the range for you.
The following example is just for illustrative purposes: