sql - 各部門の従業員数とともに部門の詳細を表示する方法は?

Question

従業員部門スキーマから、各部門の詳細(部門 ID、部門名) と各部門の従業員数を取得する方法。

Answer 1

これを試して

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 2

- (ラッセル・ディアスも示唆しているように)

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 3

INNER JOIN を使用できます。

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

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 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;