sql子查询和分组依据

我正在为我的sql类分配一个任务，我似乎无法理解。以下是所需选择的说明：

显示工资高于所在部门同事平均工资的所有员工，仅限至少有4名员工的部门

我已经找到了部分查询，比如

select ename 
  from emp
 where sal > any (select avg(sal) 
                    from emp 
                  group by 
                         deptno);

获取收入超过平均工资的员工姓名

或

获取每个部门的员工人数

但不知何故，它无法将它们联系在一起。也许有人能帮我解释一下。

你可以将Having子句与groupby连用

---

只需使用AND子句输入第二个查询：

select ename 
  from emp
 where sal > any (select avg(sal) 
                    from emp 
                  group by 
                         deptno)
and deptno in (select deptno
               from emp
               group by 
               deptno having count(deptno) > 4);

---

一个简单的解决方案。谢谢

select ename 
  from emp
 where sal > any (select avg(sal) 
                    from emp 
                  group by 
                         deptno) 
having count(*)>4;

select ename 
  from emp
 where sal > any (select avg(sal) 
                    from emp 
                  group by 
                         deptno)
and deptno in (select deptno
               from emp
               group by 
               deptno having count(deptno) > 4);

select ename 
  from (
        select deptno, count(deptno) 
        from emp
        group by deptno
        having count(deptno) > 4) valid_depts join emp ON emp.deptno=valid_depts.deptno
 where sal > any (select avg(sal) 
                    from emp 
                   group deptno);