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DROP FUNCTION
Drop a stand-alone function:
  
  Syntax:
DROP FUNCTION [schema.]function
To remove a function that is part of a package, either drop 
  the entire package using DROP PACKAGE or redefine the package using CREATE OR 
  REPLACE PACKAGE. 
  
  Related Commands:
FUNCTION - CREATE FUNCTION 
  
  FUNCTION - ALTER FUNCTION
  PACKAGE - CREATE PACKAGE 
  PACKAGE - ALTER PACKAGE 
  PACKAGE - DROP PACKAGE  
  
  Related Views:
                                                         CODE_PIECES 
                                                         CODE_SIZE 
  DBA_SOURCE           ALL_SOURCE           USER_SOURCE