What?
I need to refer to how to create a function in Oracle PL/SQL and sites on the net just attempt to overcomplicate everything and have forgotten how it is to be new to Oracle. I need a function in it's simplest form and if I want to torture my successors, I'll complicate the function myself.

How?
Functions are supposed to return a single value, which is all I need in this case. In my example, I need to submit an Active Directory (AD) username and receive a student ID number instead, all with the aim to improve performance on some SSRS queries which accept either an ID number or an AD name as user parameters.

Syntax:
copyraw
CREATE [OR REPLACE] FUNCTION function_name
    [ (parameter [,parameter]) ]

    RETURN return_datatype

IS | AS
    [declaration_section]

BEGIN
    executable_section

[EXCEPTION
    exception_section]

END [function_name];
  1.  CREATE [OR REPLACE] FUNCTION function_name 
  2.      [ (parameter [,parameter]) ] 
  3.   
  4.      RETURN return_datatype 
  5.   
  6.  IS | AS 
  7.      [declaration_section] 
  8.   
  9.  BEGIN 
  10.      executable_section 
  11.   
  12.  [EXCEPTION 
  13.      exception_section] 
  14.   
  15.  END [function_name]
Category: Oracle PL/SQL :: Article: 409

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