PLSQL Language Referenc-PL/SQL控制語句-條件選擇語句-IF THEN ELSeIF

IF 條件1 THEN

    語句1;

ELSIF 條件2 THEN

    語句2;

[ ELSIF 條件3 THEN

    語句3

]...

[ ELSE

    語句;

]

END IF;

DECLARE

    PROCEDURE p (sales NUMBER)

    IS

        bonus  NUMBER := 0;

    BEGIN

        IF sales > 50000 THEN

            bonus := 1500;

        ELSIF sales > 35000 THEN

            bonus := 500;

        ELSE

            bonus := 100;

        END IF;

        DBMS_OUTPUT.PUT_LINE (

            '銷售金額 = ' || sales || ', 獎金 = ' || bonus || '.'

        );

    END p;

BEGIN

    p(55000);

    p(40000);

    p(30000);

END;

--使用IF THEN ELSIF模擬簡單CASE

DECLARE

    grade CHAR(1);

BEGIN

    grade := 'B';

    IF grade = 'A' THEN

        DBMS_OUTPUT.PUT_LINE('優秀');

    ELSIF grade = 'B' THEN

        DBMS_OUTPUT.PUT_LINE('良好');

    ELSIF grade = 'C' THEN

        DBMS_OUTPUT.PUT_LINE('好');

    ELSIF grade = 'D' THEN

        DBMS_OUTPUT. PUT_LINE('及格');

    ELSIF grade = 'F' THEN

        DBMS_OUTPUT.PUT_LINE('不及格');

    ELSE

        DBMS_OUTPUT.PUT_LINE('沒有該等級');

    END IF;

END;