查找子表列的 SUM 小于父子总列

Question

自 4 小时以来，我一直在尝试编写一个 SQL 查询，该查询可以在子表横断（数量）超过父表中定义的最大限制时显示记录。 TB1 是父表，TB2 是子表。这是查询：

SELECT 
    SUM(b.amount) AS sum_transection,
    a.amount AS total,
    sum_transection - total AS diff
FROM 
    dbo.tb1 a INNER JOIN  dbo.tb2 b ON
    a.grp = b.grp AND a.head = b.head 
WHERE
     sum_transection - total >0

Answer 1

我认为您应该使用 Group by 来满足您的要求，并且在您的情况下不能在 Where 条件中使用 Alias。 （我正在使用 SQL Server，不确定您是否有不同的工具） 我做了一些类似的改变

SELECT 
    SUM(b.amount) AS sum_transection,
    a.amount AS total,
    SUM(b.amount) - a.amount AS diff
FROM 
    dbo.tb1 a INNER JOIN  dbo.tb2 b ON
    a.grp = b.grp AND a.head = b.head 
GROUP BY a.grp, a.amount
having SUM(b.amount) - a.amount >0