When you are finished working with tables, close them.
To close a table
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On the Window menu, click Data Session.
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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
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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.