获取在SQL查询中工作在多个部门的员工数量

Question

我想弄清楚显示号码（数量）的员工谁在超过1个部门工作的查询。这里的表名和字段：

• Employee（id_employee，employee_name，薪水）
• Department（id_dept，DEPT_NAME，预算）
• Department_Employee（id_employee，id_dept，workhours_percentage）

假设Department_Employee表的内容为

id_employee id_dept workhours_percentage 
----------- ------- -------------------- 
0001   03   100 
0001   04   50 
0001   05   60 
0002   05   60 
0002   09   90 
0003   08   80 
0004   07   80 
0005   06   60 
0006   05   70 
0007   04   75 
0008   10   95 
0009   02   25 
0010   01   40 

有了一个正确的查询，结果应该是2（员工），因为有2名员工谁在多个部门

• 员工工作在3个部门
• 员工0001工作在2个部门
技术工作

我试着用下面的查询

SELECT COUNT(DISTINCT id_employee) 
FROM Department_Employee 
GROUP BY id_employee 
HAVING COUNT(id_employee)>1 

但结果并不钻机H T。

请帮我一把。

谢谢。

Answer 1

SELECT COUNT(*) 
FROM 
(
SELECT id_employee, COUNT(*) AS CNT 
FROM Department_Employee 
GROUP BY id_employee 
) AS T 
WHERE CNT > 1 

Answer 2

要得到所有员工的工作在多个部门：

SELECT id_employee, COUNT(*) 
FROM Department_Employee 
GROUP BY id_employee 
HAVING COUNT(*)>1 

算来：

; 
WITH cte As 
(
    SELECT id_employee 
    FROM Department_Employee 
    GROUP BY id_employee 
    HAVING COUNT(*)>1 
) 
SELECT COUNT(*) FROM cte 

Answer 3

select e.id_employee, count(e.id_dep) from Department_Employee e group by e.id_employee having count(e.id_dep)>1 ; 

在此我想先设法得到由id_employee 计算部门ID组，并且我们的要求是查找属于多个部门的员工使用count（e.id_dep）> 1来检索相同。