Question

我想要显示所有带数量的项目。但数量在不同的表格中。

示例输出：

Item    Quantity
Item1   34
Item2   10
Item3   0
........

我的代码可以计算数量，但只能在单件商品中。

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 = '4786' 
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 = '4786' 
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 = '4786'
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 = '4786'
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 = '4786') as t

我如何使用此代码实现这些项目？

表格名称 items，ID为ItemId

Answer 1

创建此存储函数：

DELIMITER //

CREATE FUNCTION getItemQty(
    _itemID INT(10)
)
RETURNS INT
BEGIN

RETURN (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 = _itemID
        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 = _itemID
        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 = _itemID
        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 = _itemID
        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 = _itemID
    ) as t);
END//

使用该查询获取数据。

SELECT 
    ItemId,
    getItemQty(ItemId) AS quantity
FROM items

SUM项目＆amp;具有多个表格的数量＆amp;如果MySQL

1 个答案: