有三个表,我们必须使用一个主键和外键从这些表中选择数据。但是在一个表中,第三个表中有很多数据。我们必须在主键的基础上对数据求和。
BAl = Balance, met = Method, amo = amount, cst_id, cut_id, cut_i = customer_id
现在我们必须在同一查询中对10个cust id的方法和总和进行总结。任何人都可以帮我吗?
答案 0 :(得分:0)
如果您提供一些示例数据,则可以更轻松地编写查询来帮助您。
但是,如果您的MET
字段是数字,并且您想要求它,那么您需要。
select
t1.cst_n, t2.bal,
sum(t3.met) as met,
sum(t3.amo) as amo
from table1 as t1
inner join table2 as t2 on t2.cut_id = t1.cst_id
inner join table3 as t3 on t3.cut_i = t1.cst_id
group by t1.cst_n, t2.bal
如果您想将所有10个客户的数据汇总为一个数字,可能只需要
select
sum(t3.met) as met,
sum(t3.amo) as amo
from table3 as t3
where t3.cut_i in (select t.customerid from @<your variable table with cust. ids> as t)
答案 1 :(得分:0)
;WITH cte
AS
(
SELECT
*,
ROW_NUMBER() OVER (ORDER BY t1.cst_id) RowNum
FROM Table1 t1
INNER JOIN Table2 t2
ON t1.cst_id = t2.cut_id
INNER JOIN Table3 t3
ON t2.cut_id = t3.customer_id
AND t2.BAL = t3.Balance
AND t2.amo = t3.amount
)
SELECT SUM(*)
FROM cte
WHERE RowNum Between 1 AND 10
-- You can add a GROUP BY here