根据 B 中的多条记录从 table A 中选择记录

Question

我有以下销售结构。经理们在每个地区都被分配了一名销售人员，但他们也推销自己。下面的 table 包含经理和 salespersons/regions 之间的 link。

TABLE：MSR

Manager	Sales	Region
MA	SA	EAST
MA	SB	EAST
MA	SB	NORTH
MB	SA	WEST
MB	SB	WEST

这table列出了每个人得分的订单。

TABLE：ORD

OrderId	Sales	Region
1	MA	EAST
2	MA	WEST
3	SA	WEST
4	SA	EAST
5	SB	EAST
6	SB	WEST
7	MB	NORTH
8	SB	NORTH

我想要每个经理的订单输出。例如，经理 MA 看起来像这样：

OrderId	Sales	Region
1	MA	EAST
2	MA	WEST
4	SA	EAST
5	SB	EAST
8	SB	NORTH

对于 MB，它看起来像这样：

OrderId	Sales	Region
3	SA	WEST
6	SB	WEST
7	MB	NORTH

有SQL语句可以产生这个结果吗？

Answer 1

With cte_MA as (
Select Distinct sales from mar where manager = 'MA' 
Union 
Select Distinct manager from mar where manager = 'MA' ),
Cte_MB as (
Select Distinct sales from mar where manager = 'MB' 
Union 
Select Distinct manager from mar where manager = 'MB'),
Cte_MAorder as (
Select a orderid, a.sales, a region from ord a inner cte_MA b on a.sales = b.sales),
Cte_MBorder as (
Select a.orderid, a.sales, a.region from ord a inner cte_MB b on a.sales = b.sales)
select *  from cte_MAorder;
Select *  from cte_MBorder;

如果您运行 select * 从 cte_maorder 查询您获得 MA 分配的销售员订单列表，您应该运行所有查询最多 select 查询你运行 select * 从 cte_mborder 查询你得到 MB 分配的销售员订单列表

Answer 2

下面的查询会得到你想要的结果，你只需要换出你正在寻找的任何经理的位置，这 returns 你正在寻找的，对于 MA .

SELECT Distinct A.OrderId, A.Sales, A.Region FROM ORD a 
left join MSR b on (a.Sales = b.Sales OR B.Manager = A.Sales) and a.Region = B.Region 
where B.Manager = 'MA' or A.Sales = 'MA'
order by orderid asc

Answer 3

如果出于任何原因您需要 return/use 经理，您可以使用如下内容：

SELECT ORD.*, IFNULL(MSR.Manager,ORD.Sales) as ActualManager 
FROM ORD
LEFT JOIN MSR
 ON (ORD.Sales = MSR.Sales and ORD.Region = MSR.Region)
WHERE IFNULL(MSR.Manager,ORD.Sales) = 'MA'
ORDER BY OrderId

根据 B 中的多条记录从 table A 中选择记录

Selecting records from table A based in multiple records in B

sql

db2