PLW-06002: Unreachable code : IF « PL SQL Statements « Oracle PL/SQL Tutorial

SQL>
SQL> ALTER SESSION SET plsql_warnings = 'enable:all'
  2  /

Session altered.

SQL>
SQL> DROP FUNCTION plw6002;

Function dropped.

SQL>
SQL> CREATE OR REPLACE PROCEDURE plw6002
  2  AS
  3     l_checking BOOLEAN := FALSE;
  4  BEGIN
  5     NULL;
  6     IF l_checking
  7     THEN
  8        DBMS_OUTPUT.put_line ('Never here...');
  9     ELSE
 10        DBMS_OUTPUT.put_line ('Always here...');
 11        GOTO end_of_function;
 12     END IF;
 13     <<end_of_function>>
 14     NULL;
 15  END plw6002;
 16  /

SP2-0804: Procedure created with compilation warnings

SQL>
SQL> SHOW ERRORS PROCEDURE plw6002
Errors for PROCEDURE PLW6002:

LINE/COL ERROR
-------- -----------------------------------------------------------------
5/4      PLW-06002: Unreachable code
6/7      PLW-06002: Unreachable code
8/7      PLW-06002: Unreachable code
14/4     PLW-06002: Unreachable code
SQL>
SQL>

22.1.IF
	22.1.1.	Conditional Logic
	22.1.2.	Handling conditions
	22.1.3.	A Simple Condition Statement
	22.1.4.	A Simple Condition Statement with BOOLEAN variable
	22.1.5.	The IF...THEN...ELSE Statement
	22.1.6.	Use IF THEN ELSE IF
	22.1.7.	IF...ELSE statements
	22.1.8.	Using an ELSIF Statement
	22.1.9.	IF..ELSIF ladder
	22.1.10.	Block IF statement
	22.1.11.	IF with ELSE
	22.1.12.	The Syntax for IF...ELSIF
	22.1.13.	ELSIF Ladder
	22.1.14.	The Syntax for Nested IF Statements
	22.1.15.	Use if with 'IN'
	22.1.16.	Three valued comparison
	22.1.17.	JUMP out of a IF statement with goto
	22.1.18.	Comparing with NULL
	22.1.19.	If block statement
	22.1.20.	Create a function and call it in an if statement
	22.1.21.	PLW-06002: Unreachable code