PLW-05005: function NO_RETURN returns without value at line 21 : Function « Function Procedure Packages « Oracle PL/SQL Tutorial

SQL>
SQL> CREATE OR REPLACE FUNCTION no_return (check_in IN BOOLEAN)
  2     RETURN VARCHAR2
  3  AS
  4  BEGIN
  5     IF check_in
  6     THEN
  7        RETURN 'abc';
  8     ELSE
  9        DBMS_OUTPUT.put_line ('Here I am, here I stay');
 10
 11        IF check_in
 12        THEN
 13           RETURN 'def';
 14        ELSIF SYSDATE IS NOT NULL
 15        THEN
 16           RETURN 'qrs';
 17        ELSE
 18           DBMS_OUTPUT.put_line ('Hello!');
 19        END IF;
 20     END IF;
 21  END no_return;
 22  /

SP2-0806: Function created with compilation warnings

SQL>
SQL> SHOW ERRORS FUNCTION no_return
Errors for FUNCTION NO_RETURN:

LINE/COL ERROR
-------- -----------------------------------------------------------------
1/1      PLW-05005: function NO_RETURN returns without value at line 21
SQL>

27.1.Function
	27.1.1.	Functions
	27.1.2.	Describe a user-defined function
	27.1.3.	create or replace FUNCTION iifn(boolean_expression in BOOLEAN,true_number IN NUMBER,false_number IN NUMBER)
	27.1.4.	Storing PL/SQL function in the Database
	27.1.5.	Create a simple function
	27.1.6.	Creating a Function to deal with business rules
	27.1.7.	CREATE OR REPLACE a function
	27.1.8.	Calling a Function
	27.1.9.	Calling a Function for a table
	27.1.10.	Function without parameters
	27.1.11.	Exit a function
	27.1.12.	How to Call a Function from PL/SQL With or Without Parameters
	27.1.13.	Local Subprograms
	27.1.14.	Dependency Example
	27.1.15.	The FullName Function
	27.1.16.	PLW-05005: function NO_RETURN returns without value at line 21
	27.1.17.	Use function to check passwords