Name
   DROP FUNCTION
   --    Removes a user-defined C function
  
Synopsis
DROP FUNCTION name ( [ type [, ...] ] )
  
    Inputs
   
    
-  name
- 	The name of an existing function.
        
- type
- 	The type of function parameters.
        
    Outputs
   
    
- DROP
       
- 	Message returned if the command completes successfully.
        
- NOTICE RemoveFunction: Function "name" ("types") does not exist
       
- 	This message is given if the function specified does not
	exist in the current database.
        
   Description
  
   DROP FUNCTION will remove references to an existing C
   function. To execute this command the user must be the
   owner of the function. The input argument types to the
   function must be specified, as only the function with the
   given name and argument types will be removed.
  
    Notes
   
    Refer to
    CREATE FUNCTION
    for information on creating aggregate functions.
   
    No checks are made to ensure that types, operators or access
    methods that rely on the function have been removed first.
   
   Usage
  
   This command removes the square root function:
   
DROP FUNCTION sqrt(int4);
   
     Compatibility
  
    SQL92
   
    DROP FUNCTION
    is a Postgres language extension.
   
    SQL/PSM
   
    SQL/PSM is a standard to enable function extensibility.
    The SQL/PSM DROP FUNCTION statement has the following syntax:
    
DROP [ SPECIFIC ] FUNCTION name { RESTRICT | CASCADE }