--子查询 查询last_name为chen的manager信息select employee_id,last_name
from employees
where employee_id=(
select manager_id
from employees
where last_name='Chen'
)运行结果
--查询
select employee_id,manager_id,department_id
from employees
where manager_id in(
select manager_id
from employees
where employee_id in(141,147)
)
and department_id in(
select department_id
from employees
where employee_id in(141,147))
and employee_id not in(141,174)运行结果
、
)
