Question

我正在编写一个查询，列出银行业务场景中特定员工所服务的客户数量。

表格的设计如下：

以下查询产生了我需要的结果：

SELECT 
    EMPID, COUNT(EMPID) AS 'Customers Served' 
FROM 
    Financial.AccountOperations 
GROUP BY 
    EMPID;

SELECT 
    EMPID, COUNT(EMPID) AS 'Customers Served' 
FROM 
    Financial.LoanOperations
GROUP BY 
    EMPID;

Query Results

我正在尝试将查询合并为一个。我尝试过使用UNION，INTERSECT，JOIN和子查询但没有成功。

有人可以帮忙吗？

所需的输出如下：

 EMPID         Customers Served  
   2                2  
   3                3  
   4               17  
   5               16  
   7                2  
   8                4  
   9                8  
  10                5  
  12                1  
  15                1

Answer 1

你试过这个：

SELECT EMPID,COUNT(EMPID) AS 'Customers Served' 
FROM Financial.AccountOperations
GROUP BY EMPID

UNION

SELECT EMPID,COUNT(EMPID) AS 'Customers Served'
FROM Financial.LoanOperations 
GROUP BY EMPID;

我想我会这样做

SELECT 'Account' AS Source, EMPID,COUNT(EMPID) AS 'Customers Served' 
FROM Financial.AccountOperations
GROUP BY EMPID

UNION ALL

SELECT 'Loan' AS Source, EMPID,COUNT(EMPID) AS 'Customers Served'
FROM Financial.LoanOperations 
GROUP BY EMPID;

Answer 2

我认为@Hogan有它 - 再多花一步：

SELECT EMPID, Sum([Customers Served]) AS NumServed FROM
(SELECT EMPID,COUNT(EMPID) AS 'Customers Served' 
FROM Financial.AccountOperations
GROUP BY EMPID
UNION
SELECT EMPID,COUNT(EMPID) AS 'Customers Served'
FROM Financial.LoanOperations 
GROUP BY EMPID)
GROUP BY EMPID

SQL Server：带连接的多个计数

2 个答案: