PL/SQL switch if语句

Question

如何将此嵌套IF语句更改为复合IF语句，我知道它几乎相同，但我不知道如何使用我的代码实现该语句。

SET VERIFY OFF 
DECLARE 
    v_idno donornew.idno%TYPE :=&input_idno; 
    v_yrgoal donornew.yrgoal%TYPE; 
    v_newgoal donornew.yrgoal%TYPE; 
    v_state donornew.state%TYPE; 
    v_city donornew.city%TYPE; 
BEGIN 
    SELECT yrgoal, state, city INTO v_yrgoal, v_state, v_city 
FROM donornew 
WHERE idno = v_idno; 
IF v_state = 'MA' AND (v_yrgoal < 400 or v_city = 'Fall River') THEN 
     v_newgoal := v_yrgoal * 2.5; 
     ELSE 
     v_newgoal := v_yrgoal * 1.3; 
END IF; 
UPDATE donornew 
SET yrgoal = v_newgoal 
WHERE idno = v_idno; 
COMMIT; 
END; 
/

SET核实

Answer 1

Hello bascically for thsi purpose i will suggest you to go with purely SQL logic rather than PLSQL approach. Merge is the perfect example to resolve your issues. 

    -- Approach is to use SQL approach rather then using PLSQL approach. 

    MERGE INTO donornew D USING 
    (SELECT yrgoal, 
     state, 
     city, 
     idno, 
     CASE 
     WHEN state = 'MA' 
     AND (yrgoal < 400 
     OR city  = 'Fall River') 
     THEN yrgoal * 2.5 
     ELSE yrgoal * 1.3 
     END newgoal 
    FROM donornew 
    WHERE idno = v_idno -- Input IDNO 
    )A ON (d.idno = a.idno) 
    WHEN MATCHED THEN 
     UPDATE SET yrgoal = a.newgoal; 

Let me know if this helps.