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DEALLOCATE
DEALLOCATE — deallocate a prepared statement
Synopsis
DEALLOCATE [ PREPARE ] { name | ALL }
  Description
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.
Parameters
- 
      
PREPARE - 
      
This key word is ignored.
 - 
      
name - 
      
The name of the prepared statement to deallocate.
 - 
      
ALL - 
      
Deallocate all prepared statements.
 
Compatibility
The SQL standard includes a DEALLOCATE statement, but it is only for use in embedded SQL.
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 https://www.postgresql.org/docs/10/sql-deallocate.html