Boolean literals : Boolean « PL SQL Data Types « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. PL SQL Data Types
3. Boolean

SQL>
SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
  2     v_true BOOLEAN := TRUE;
  3     v_false BOOLEAN := FALSE;
  4     v_null BOOLEAN := NULL;
  5  BEGIN
  6     IF v_true
  7     THEN
  8        DBMS_OUTPUT.PUT_LINE('true');
  9     END IF;
 10
 11     IF v_false
 12     THEN
 13        DBMS_OUTPUT.PUT_LINE('false');
 14     END IF;
 15
 16     IF v_null
 17     THEN
 18        DBMS_OUTPUT.PUT_LINE('null');
 19     END IF;
 20  END;
 21  /
true

PL/SQL procedure successfully completed.

SQL>