如何顯示部門詳細信息以及每個部門的員工數量？

Question

從員工部門架構如何讓員工與各部門的數量以及每個部門（部門ID，部門名稱）的細節。

Answer 1

，你可以採取爲 - （羅素·迪亞斯也建議）

select d.deptId, 
     deptName, 
     count(e.empid) "number of employees" 
from department d, employee e 
where d.deptid = e.deptid 
group by d.deptid,d.deptname 

Answer 2

試試這個

select dept.deptId, 
    deptName, 
    count(emp.empid) as numb_of_emps 
    from department dept inner join employee emp 
    on dept.deptid = emp.deptid 
    group by dept.deptid 

Answer 3

如果您並不需要實際部門的細節，而只是部門名稱你可以這樣簡化：

SELECT department_name, COUNT(*) AS "Number of employees" 
FROM employees group by department; 

Answer 4

select d.deptno,dname,count(e.empno) "No of Emp" 
from dept d, emp e 
where d.deptno = e.deptno 
group by d.deptno,d.dname 

Answer 5

SELECT department_name,COUNT(*) FROM employees a,departments b 
where a.department_id=b.department_id 
group by department_name; 

Answer 6

select d.deptno, d.dname, count(e.empno) "Number of employees" 
from dept d, emp e 
where d.deptno = e.deptno 
group by d.deptno,d.dname; 

Answer 7

您可以使用INNER JOIN：

Select e.EmployeeName, 
     d.DepartmentName, 
     count(d.DepId)As Total_no_of_Employees 
From Department d 
Inner join Employee e 
    On d.DepId = e.EmpID 
Groub By DepartmentName, Total_no_of_Employees