Question

我正在从三个不同的表中检索

SELECT lc_orders_tb.lc_orderID, lc_orders_tb.lc_orderSubTotal, lc_orders_tb.lc_orderTotal, lc_orders_tb.lc_orderPlacedDate, lc_tb.lc_compName, lc_tb.lc_addCity, lc_orderQuantity_tb.lc_orderID, 
     sum(lc_orderQuantity_tb.lc_orderQuantity) 
AS    lc_orderQuantity 
FROM  lc_orders_tb, lc_orderQuantity_tb, lc_tb 
WHERE lc_orders_tb.lc_id=lc_tb.lc_id 
AND   lc_orderQuantity_tb.lc_orderID=lc_orders_tb.lc_orderID 
GROUP BY lc_orderQuantity_tb.lc_orderID

我想在gridview中显示上面检索到的值。对于必须与两个表匹配的特定lc_orderQuantity，只需要lc_orderID求和，即lc_orders_tb和lc_orderQuantity_tb。

有人可以帮帮我..

提前谢谢。

Answer 1

;WITH q AS 
(
    SELECT lc_OrderID, lc_OrderQuantity = SUM(lc_orderQuantity)
        FROM dbo.lc_orderQuantity_tb
        GROUP BY lc_OrderID
)
SELECT 
    o.lc_orderID, 
    o.lc_orderSubTotal, 
    o.lc_orderTotal, 
    o.lc_orderPlacedDate, 
    lc.lc_compName, 
    lc.lc_addCity, 
    q.lc_orderQuantity
FROM
    dbo.lc_orders_tb AS o
INNER JOIN
    q ON o.lc_orderID = q.lc_OrderID
INNER JOIN
    dbo.lc_tb AS lc
    ON o.lc_id = lc.lc_id;

Answer 2

除了Aaron的解决方案（我更喜欢）之外，如果您没有使用不支持WITH子句的数据库，您还可以使用内联查询

来自

的内联查询

SELECT 
    o.lc_orderID, 
    o.lc_orderSubTotal, 
    o.lc_orderTotal, 
    o.lc_orderPlacedDate, 
    lc.lc_compName, 
    lc.lc_addCity, 
    q.lc_orderQuantity
FROM
    dbo.lc_orders_tb AS o
INNER JOIN
    (  SELECT lc_OrderID, lc_OrderQuantity = SUM(lc_orderQuantity)
        FROM dbo.lc_orderQuantity_tb
        GROUP BY lc_OrderID) q ON o.lc_orderID = q.lc_OrderID
INNER JOIN
    dbo.lc_tb AS lc
    ON o.lc_id = lc.lc_id;

或在SELECT子句中

 SELECT 
        o.lc_orderID, 
        o.lc_orderSubTotal, 
        o.lc_orderTotal, 
        o.lc_orderPlacedDate, 
        lc.lc_compName, 
        lc.lc_addCity, 
        (SELECT SUM(lc_orderQuantity)
            FROM dbo.lc_orderQuantity_tb o
            WHERE o.lc_orderID = q.lc_OrderID
        ) as lc_orderQuantity
    FROM
        dbo.lc_orders_tb AS o
       INNER JOIN
        dbo.lc_tb AS lc
        ON o.lc_id = lc.lc_id;

您还可以在SQL 2005 +

中使用CROSS APPLY

 SELECT 
        o.lc_orderID, 
        o.lc_orderSubTotal, 
        o.lc_orderTotal, 
        o.lc_orderPlacedDate, 
        lc.lc_compName, 
        lc.lc_addCity, 
        q.lc_orderQuantity
    FROM
        dbo.lc_orders_tb AS o
       INNER JOIN
        dbo.lc_tb AS lc
        ON o.lc_id = lc.lc_id
       CROSS APPLY 
       (SELECT 
            SUM(lc_orderQuantity) lc_orderQuantity
        FROM
             lc_orderQuantity_tb t
        WHERE o.lc_orderID  = t.lc_orderID) q

从ms sql中的三个表求和

2 个答案: