Question

我想显示items表的所有记录。但有些数量需要是负值。

BEGIN 
    SET @ItemId1 = (SELECT ItemId FROM items);

    SELECT 
        SUM(ROUND(Quantity)) 
    FROM (
        SELECT
            COALESCE(SUM(od.Quantity),0) as Quantity
        FROM sts as T1
        LEFT JOIN orderset_details as od 
            ON T1.OrdersetId = od.OrdersetId
        WHERE od.ItemId = @ItemId1
        UNION ALL
        SELECT 
            COALESCE(SUM(od.Quantity),0) as Quantity
        FROM drs as T2
        LEFT JOIN orderset_details as od 
            ON T2.OrdersetId = od.OrdersetId
        WHERE od.ItemId = @ItemId1
        UNION ALL  
        SELECT 
            COALESCE(
                SUM(
                    IF(r.AddsToStock = '1', od.Quantity, 0 - od.Quantity)
                ),0
            ) as Quantity
        FROM stockadjustment as T3
        LEFT JOIN reason as r 
            ON r.ReasonId = T3.ReasonId
        LEFT JOIN orderset_details as od 
            ON T3.OrdersetId = od.OrdersetId 
        WHERE od.ItemId = @ItemId1
        UNION ALL
        SELECT 
            COALESCE(
                SUM(
                    IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)
                ),0
            ) as Quantity
        FROM issueslip as T4
        LEFT JOIN orderset_details as od 
            ON T4.OrdersetId = od.OrdersetId 
        WHERE od.ItemId = @ItemId1
        UNION ALL
        SELECT 
            COALESCE(
                SUM(
                    IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)
                ),0
            ) as Quantity
        FROM invoice as T4
        LEFT JOIN orderset_details as od 
            ON T4.OrdersetId = od.OrdersetId
        WHERE od.ItemId = @ItemId1
    ) as t;
END

此代码出现错误MySQL said: #1242 -Subquery returns more than 1 row。

我想要显示每件商品的所有数量。这就是为什么我有@ ItemId1得到所有ItemId from items。我怎么能这样做？

Answer 1

您应该按ItemId进行分组。试试这个

SELECT 
    ItemId, SUM(ROUND(Quantity)) 
FROM (
    SELECT
        od.ItemId, COALESCE(SUM(od.Quantity),0) as Quantity
    FROM sts as T1
    LEFT JOIN orderset_details as od 
        ON T1.OrdersetId = od.OrdersetId
   -- WHERE od.ItemId = @ItemId1
    GROUP BY od.ItemId
    UNION ALL
    SELECT 
        od.ItemId, COALESCE(SUM(od.Quantity),0) as Quantity
    FROM drs as T2
    LEFT JOIN orderset_details as od 
        ON T2.OrdersetId = od.OrdersetId
    --WHERE od.ItemId = @ItemId1
    GROUP BY od.ItemId
    UNION ALL  
    SELECT 
      od.ItemId,
        COALESCE(
            SUM(
                IF(r.AddsToStock = '1', od.Quantity, 0 - od.Quantity)
            ),0
        ) as Quantity
    FROM stockadjustment as T3
    LEFT JOIN reason as r 
        ON r.ReasonId = T3.ReasonId
    LEFT JOIN orderset_details as od 
        ON T3.OrdersetId = od.OrdersetId 
    --WHERE od.ItemId = @ItemId1
    GROUP BY od.ItemId
    UNION ALL
    SELECT 
       od.ItemId,
        COALESCE(
            SUM(
                IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)
            ),0
        ) as Quantity
    FROM issueslip as T4
    LEFT JOIN orderset_details as od 
        ON T4.OrdersetId = od.OrdersetId 
    --WHERE od.ItemId = @ItemId1
    GROUP BY od.ItemId
    UNION ALL
    SELECT 
        od.ItemId
        COALESCE(
            SUM(
                IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)
            ),0
        ) as Quantity
    FROM invoice as T4
    LEFT JOIN orderset_details as od 
        ON T4.OrdersetId = od.OrdersetId
    --WHERE od.ItemId = @ItemId1
    GROUP BY od.ItemId
) as t
GROUP BY ItemId;

具有多个表的MySQL存储过程

1 个答案: