MySQL：如何将子级的SUM（）值更新到同一表中的父行？

我需要获取子行的总和值，并更新父行上的数据。 我得到了如下所示的结果，但遇到了错误#1111（组函数的使用无效）

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您需要做的是按id分组，以分离每个父id的子和。您需要使用subselect来完成此操作

此外，您不需要创建临时表。只需将聚合包装在子选择中（按父项id分组），并将子选择连接到主表：

UPDATE 
    cms_ladu a
INNER JOIN
(
    SELECT   parent_id, 
             SUM(packaging_units_in) AS pui,
             SUM(net_weight_in) AS nwi
    FROM     cms_ladu
    WHERE    parent_id IN (326,500)
    GROUP BY parent_id
) b ON a.id = b.parent_id
SET 
    a.child_packaging_units_in = b.pui,
    a.child_net_weight_in = b.nwi

试一试

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请问，如何在MS SQLSERVER中执行此操作？它不接受这种联合税。

UPDATE 
    cms_ladu a
INNER JOIN
(
    SELECT   parent_id, 
             SUM(packaging_units_in) AS pui,
             SUM(net_weight_in) AS nwi
    FROM     cms_ladu
    WHERE    parent_id IN (326,500)
    GROUP BY parent_id
) b ON a.id = b.parent_id
SET 
    a.child_packaging_units_in = b.pui,
    a.child_net_weight_in = b.nwi

UPDATE  cms_ladu a
    INNER JOIN (SELECT parent_id, SUM(packaging_units_in) AS packaging_units_in, SUM(net_weight_in) AS net_weight_in FROM cms_ladu_temp WHERE id IN (326,500) GROUP BY parent_id) b
        ON b.parent_id=a.id
SET     a.child_packaging_units_in = b.packaging_units_in
    ,a.child_net_weight_in = b.net_weight_in