带有连接表的SUM的COALESCE计算不正确

Question

我正在使用5个不同表的联合处理Join表 因为我已经为联合所有表编写了代码，并且它没有连接表而正常工作

你可以看到代码

    SELECT  sku,
        sum(units_ordered) as units_ordered
FROM   (
        SELECT sku, units_ordered
        FROM   tbl_sku_units_order 
        UNION ALL
        SELECT sku, units_ordered
        FROM   tbl_sku_units_order_de
        UNION ALL
        SELECT sku, units_ordered
        FROM   tbl_sku_units_order_es
        UNION ALL
        SELECT sku, units_ordered
        FROM   tbl_sku_units_order_fr
        UNION ALL
        SELECT sku, units_ordered
        FROM   tbl_sku_units_order_it
       ) AllMarketplace
group by sku
ORDER BY units_ordered DESC;

你可以在db fiddle的第一个链接中看到结果

https://www.db-fiddle.com/f/nbGcxACaf4doHRssJDSyRN/0，结果是正确的

你可以看到＆＃34; H-Root-M012S-Black 87＆＃34;这是正确的QTY股票总数。

我需要他们加入其他一个表作为左连接。 这是db fiddle

中的代码

https://www.db-fiddle.com/f/dxqsU4enjRYqk7du7VEB4d/0

这是我写的代码

SELECT 
    ls.sku                                  AS list_sku,
    COALESCE(MIN(suo.sku), 'Not Sold')      AS sold_sku,
    COALESCE(SUM(suo.units_ordered), 0)     AS units_ordered
FROM
    (SELECT 
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order 
        UNION ALL
        SELECT  
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_de
        UNION ALL
        SELECT 
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_es
        UNION ALL
        SELECT 
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_fr
        UNION ALL
        SELECT  
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_it
    ) as t1,
    tbl_list_sku AS ls
        LEFT JOIN
    tbl_sku_units_order AS suo ON suo.sku = ls.sku
GROUP BY ls.sku
ORDER BY units_ordered DESC;

它返回正常，但计算错误

由于团体问题，我怀疑它？我必须在组上调整它，但所有结果都返回相同的结果以及右或内连接表。

Answer 1

你的SQL应该是这样的：

SELECT 
    ls.sku                                  AS list_sku,
    COALESCE(MIN(suo.sku), 'Not Sold')      AS sold_sku,
    COALESCE(SUM(suo.units_ordered), 0)     AS units_ordered
FROM
    (SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order 
        UNION ALL
        SELECT sku,  
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_de
        UNION ALL
        SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_es
        UNION ALL
        SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_fr
        UNION ALL
        SELECT  sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_it
    ) as t1 join 
    tbl_list_sku AS ls on t1.sku = ls.sku
        LEFT JOIN
    tbl_sku_units_order AS suo ON suo.sku = ls.sku
GROUP BY ls.sku
ORDER BY units_ordered DESC;

EDIT-1

SELECT 
    ls.sku                                  AS list_sku,
    COALESCE(MIN(suo.sku), 'Not Sold')      AS sold_sku,
    COALESCE(SUM(suo.units_ordered), 0)     AS units_ordered
FROM tbl_list_sku AS ls left join
    (SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order 
        UNION ALL
        SELECT sku,  
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_de
        UNION ALL
        SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_es
        UNION ALL
        SELECT sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_fr
        UNION ALL
        SELECT  sku,
        COALESCE(MIN(sku), 'Not Sold')      AS sold_sku,
        COALESCE(SUM(units_ordered), 0)     AS units_ordered
        FROM   tbl_sku_units_order_it
    ) as t1 on t1.sku = ls.sku
        LEFT JOIN
    tbl_sku_units_order AS suo ON suo.sku = ls.sku
GROUP BY ls.sku
ORDER BY units_ordered DESC;