Not equal operator
SQL> SQL> SET SERVEROUTPUT ON SIZE 1000000 SQL> DECLARE 2 lv_test_num NUMBER(3); 3 lv_test_txt VARCHAR2(5); 4 lv_complete_bln BOOLEAN; 5 BEGIN 6 IF lv_test_num != 10 THEN 7 DBMS_OUTPUT.PUT_LINE('Number Test: TRUE'); 8 ELSE 9 DBMS_OUTPUT.PUT_LINE('Number Test: FALSE'); 10 END IF; 11 IF lv_test_txt != 'TEMP' THEN 12 DBMS_OUTPUT.PUT_LINE('Character Test: TRUE'); 13 ELSE 14 DBMS_OUTPUT.PUT_LINE('Character Test: FALSE'); 15 END IF; 16 IF NOT lv_complete_bln THEN 17 DBMS_OUTPUT.PUT_LINE('Boolean Test: TRUE'); 18 ELSE 19 DBMS_OUTPUT.PUT_LINE('Boolean Test: FALSE'); 20 END IF; 21 END; 22 / Number Test: FALSE Character Test: FALSE Boolean Test: FALSE PL/SQL procedure successfully completed. SQL> SQL>