Question

我有这些表，每个表可以有多行。

表ta（eid，金额）
表tb（eid，金额）
表tc（eid，金额）

每个表都有这样的数据行：

ta：

1001  100.00
1001   20.10

待定：

1001   200.00
1001   32.10

tc：

1001   300.00
1001   20.10

我需要的解决方案：具有eid的单行和每个表的“金额”列的汇总

1001   120.10     232.10   320.10

我尝试过此方法，但它显示的是数量乘以我正在使用的表的数量

select 
    ta.eid, 
    sum(ta.Amount) as taAmount, 
    sum(tb.Amount) as tbAmount, 
    sum(tc.Amount) as tcAmount
from 
    ta , tb, tc
where 
    ta.eid = tb.eid 
    and tb.eid = tc.eid
group by 
    ta.eid

请帮助我知道如何实现？

Answer 1

利用派生表或CTE首先获取合计金额

select ta.eid, ta.amount, tb.amount, tc.amount
from   (select eid, amount= sum(amount) from ta group by eid) ta
join   (select eid, amount= sum(amount) from tb group by eid) tb on ta.eid = tb.eid
join   (select eid, amount= sum(amount) from tc group by eid) tc on ta.eid = tc.eid

如果eid可能未出现在所有表格中，则可以获取eid列表，然后LEFT JOIN依次显示ta，tb和tc

select i.eid, ta.amount, tb.amount, tc.amount
from   (select eid from ta union select eid from tb union select eid from tc) i
left join (select eid, amount= sum(amount) from ta group by eid) ta on i.eid = ta.eid
left join (select eid, amount= sum(amount) from tb group by eid) tb on i.eid = tb.eid
left join (select eid, amount= sum(amount) from tc group by eid) tc on i.eid = tc.eid

SQL Server，在单个查询中显示多个表的合计金额

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