DECLARE 
A INT :=30; 
BEGIN 
IF ( A > 20) THEN 
dbms_output.put_line('A IS GRATER THEN 20'); 
ELSIF ( A < 20) THEN 
dbms_output.put_line('A IS LESS THEN 20'); 
ELSE 
dbms_output.put_line('INPUT IS NOT VALID'); 
END IF; 
END; 

DECLARE 
A INT :=30; 
BEGIN 
IF ( A = 20) THEN 
dbms_output.put_line('A IS GRATER THEN 20'); 
ELSIF ( A = 21) THEN 
dbms_output.put_line('A IS LESS THEN 20'); 
ELSE 
dbms_output.put_line('INPUT IS NOT VALID'); 
END IF; 
dbms_output.put_line('YOUR NUMBER IS :' || A); 
END; 

DECLARE 
GRADE CHAR(1) :='A'; 
MARKS NUMBER(2) := 85; 
BEGIN 
CASE 
 WHEN GRADE='A' THEN 
 DBMS_OUTPUT.PUT_LINE('YOUR GRADE IS Excellent'); 
END CASE; 
CASE  
 WHEN MARKS>80 THEN 
 DBMS_OUTPUT.PUT_LINE('YOUR MARKS IS ALSO Excellent'); 
END CASE; 
END; 

DECLARE 
GRADE CHAR(1) :='A'; 
MARKS NUMBER(2) := 85; 
BEGIN 
CASE 
 WHEN GRADE='A' THEN 
 DBMS_OUTPUT.PUT_LINE('YOUR GRADE IS Excellent'); 
 WHEN GRADE='B' THEN 
 DBMS_OUTPUT.PUT_LINE('YOUR GRADE IS GOOD'); 
END CASE; 
CASE  
 WHEN MARKS>80 THEN 
 DBMS_OUTPUT.PUT_LINE('YOUR MARKS IS ALSO Excellent'); 
END CASE; 
END;