MySQL的 - 查詢使用分組條件

Question

嗨，

我有錶行像上面的圖片，我想總結的所有行的數量，但我需要排除排在那裏AISLE = POS和數量< 0在同一行上。

我做了一些嘗試得到我想要什麼，但我不能找到解決辦法：

SELECT 
    ROUND(SUM(QTY), 
    2) AS INVENTORY 
FROM 
    INV_QTY_LOCATION 
WHERE 
    PRODUCT = 143459 AND AISLE != 'PHY' AND AISLE != 'RET' AND case when AISLE = 'POS' AND QTY > 0 

闖闖

SELECT 
    ROUND(SUM(QTY), 
    2) AS INVENTORY 
FROM 
    INV_QTY_LOCATION 
WHERE 
    PRODUCT = 143459 AND AISLE != 'PHY' AND AISLE != 'RET' AND (AISLE = 'POS' AND QTY > 0) 

在這種特殊情況下的結果應該是161

解決方案

SELECT 
    ROUND(
    SUM(
     CASE WHEN(AISLE = 'POS' AND QTY > 0) OR AISLE != 'POS' THEN QTY ELSE 0 
    END 
), 
    2 
) AS INVENTORY 
FROM 
    INV_QTY_LOCATION 
WHERE 
    PRODUCT = 143459 AND AISLE != 'PHY' AND AISLE != 'RET' 

Answer 1

我要指出， NOT IN將是該查詢有所幫助：

WHERE PRODUCT = 143459 AND 
     AISLE NOT IN ('PHY', 'RET') AND 
     (AISLE <> 'POS' OR QTY > 0) 

注：這是假定AISLE我從來沒有NULL。

，或者：

WHERE PRODUCT = 143459 AND 
     AISLE NOT IN ('PHY', 'RET') AND 
     NOT (AISLE = 'POS' AND QTY > 0) 

Answer 2

你的第二個說法幾乎是正確的，但因爲你正在嘗試「排除AISLE = POS」，那麼就應該是AISLE <> 'POS'：

SELECT 
    ROUND(SUM(QTY), 
    2) AS INVENTORY 
FROM 
    INV_QTY_LOCATION 
WHERE 
    PRODUCT = 143459 AND AISLE != 'PHY' AND AISLE != 'RET' AND (AISLE <> 'POS' OR QTY > 0) 

Answer 3

嘗試使用

AND (AISLE <> 'POS' OR QTY >= 0)