PL/SQL程序動態傳遞值

Question

WITH CTE AS 
(SELECT 
F.PARTITION_KEY, 
(LAST_DAY(TO_DATE((PARTITION_KEY)||'01','YYYYMMDD'))) AS VALID_DATE, 
F.EMP_NUM, 
F.EMP_KEY, 
D.EMP_ENTERED_DATE 
FROM F_EMP_ERROR, D_EMP D 
WHERE 
F.EMP_NUM = D.EMP_NUM 
AND F.PARTITION_KEY = 201603 
and d.CONTRACT_PERIOD = 'Y') 
SELECT COUNT(DISTINCT EMP_NUM) FROM CTE WHERE EMP_ENTERED_DATE > VALID_DATE; 

我的查詢工作正常，如果我硬編碼一個特定的月份。如何將它轉換爲一種方式，當我輸入年，它應該返回記錄數在那一年的所有月份。

Answer 1

假設你的密鑰被存儲爲varchar2格式YYYYMM，你可以使用：

CREATE FUNCTION fun(yearKey IN VARCHAR2) 
    RETURN NUMBER AS 
    retVal NUMBER; 
BEGIN 
    WITH CTE AS 
      (SELECT F.PARTITION_KEY, 
        (LAST_DAY(TO_DATE((PARTITION_KEY) || '01', 'YYYYMMDD'))) AS VALID_DATE, 
        F.EMP_NUM, 
        F.EMP_KEY, 
        D.EMP_ENTERED_DATE 
       FROM F_EMP_ERROR, D_EMP D 
       WHERE  F.EMP_NUM = D.EMP_NUM 
        AND F.PARTITION_KEY like yearKey || '%' 
        AND d.CONTRACT_PERIOD = 'Y') 
    SELECT COUNT(DISTINCT EMP_NUM) 
     INTO retVal 
     FROM CTE 
    WHERE EMP_ENTERED_DATE > VALID_DATE; 

    RETURN retVal; 
END;