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SQL Reference
Deallocates a prepared statement.
DEALLOCATE [PREPARE] { <name> | ALL }
DEALLOCATE is used to deallocate a previously prepared SQL statement. If you do not explicitly deallocate a prepared statement, it is deallocated when the session ends.
For more information on prepared statements, see PREPARE.
Deallocate the previously prepared statement named insert_names:
DEALLOCATE insert_names;
The SQL standard includes a DEALLOCATE statement, but it is only for use in embedded SQL.