When you are finished working with tables, close them.
To close a table
On the Window menu, click Data Session.
In the Data Session window, click the alias for the table you want to close, then Close.
The table closes.
To close a table programmatically
Use the CLOSE command with the TABLES keyword.
Note: CLOSE TABLES closes all tables in the currently selected database or all free tables in all work areas if no database is open.
For more information, see CLOSE Commands.