甲骨文複雜的SQL SELECT查詢

Question

我有以下查詢：

SELECT SUM (UNCOLLECTED) 
      FROM LIQUIDATIONSDETAILS LD 
      WHERE  LD.COMPANYID = L.COMPANYID 
       AND LD.GROUPID = L.GROUPID 
       AND LD.PERIODID = L.PERIODID 
       AND LD.FORMTYPE IN (1, 2, 3) 

我需要的時候L.PERIODID > '2013-2014'那麼LD.FORMTYPE IN (1,2,3,4)其他LD.FORMTYPE IN (1,2,3)

什麼想法？

Answer 1

這可能是答案

SELECT SUM (UNCOLLECTED) 
     FROM LIQUIDATIONSDETAILS LD 
     WHERE  LD.COMPANYID = L.COMPANYID 
      AND LD.GROUPID = L.GROUPID 
      AND LD.PERIODID = L.PERIODID 
      AND (L.PERIODID > '2013-2014' AND LD.FORMTYPE IN (1, 2, 3)) 
      OR (L.PERIODID <= '2013-2014' AND LD.FORMTYPE IN (1, 2, 3,4)) 

Answer 2

您所查詢的格式不正確。您有兩個表別名，L和LD，但未定義L。

因爲您打算使用JOIN，所以應該使用明確的JOIN語法。一個簡單的規則：從不在FROM子句中使用逗號。 始終使用顯式JOIN語法：

SELECT SUM(UNCOLLECTED) 
FROM LIQUIDATIONSDETAILS LD JOIN 
    ??? L  -- I don't know what table "L" refers to 
    ON LD.COMPANYID = L.COMPANYID AND 
     LD.GROUPID = L.GROUPID AND 
     LD.PERIODID = L.PERIODID 
WHERE LD.FORMTYPE IN (1, 2, 3) OR 
     (LD.FORMTYPE = 4 AND L.PERIODID > '2013-2014')