plsql
Déclaration IF-THEN-ELSE

Syntaxe

• SI [condition 1] ALORS

• [instructions à exécuter lorsque la condition 1 est TRUE];

• ELSIF [condition 2] PUIS

• [instructions à exécuter lorsque la condition 2 est TRUE];

• AUTRE

• [instructions à exécuter lorsque les deux conditions 1 et 2 sont FALSE];

• FIN SI;

SI DONC

DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);

BEGIN
  v_num1 := 2;
  v_num2 := 1;
  
  IF v_num1 > v_num2 THEN
     dbms_output.put_line('v_num1 is bigger than v_num2');
  END IF;
END;

IF-THEN-ELSE

DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);

BEGIN
  v_num1 := 2;
  v_num2 := 10;
  
  IF v_num1 > v_num2 THEN
     dbms_output.put_line('v_num1 is bigger than v_num2');
  ELSE
    dbms_output.put_line('v_num1 is NOT bigger than v_num2');
  END IF;
END;

IF-THEN-ELSIF-ELSE

DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);

BEGIN
  v_num1 := 2;
  v_num2 := 2;
  
  IF v_num1 > v_num2 THEN
     dbms_output.put_line('v_num1 is bigger than v_num2');
  ELSIF v_num1 < v_num2 THEN
    dbms_output.put_line('v_num1 is NOT bigger than v_num2');
  ELSE
    dbms_output.put_line('v_num1 is EQUAL to v_num2');
  END IF;
END;