1.	查询和Zlotkey相同部门的员工姓名和雇用日期
a)	select last_name,hire_date
b)	from employees
c)	where department_id = (
d)	                      select department_id
e)	                      from employees
f)	                      where last_name = 'Zlotkey'
g)	                      )
h)	and last_name <> 'Zlotkey'
2.	查询工资比公司平均工资高的员工的员工号，姓名和工资。
a)	select last_name,employee_id,salary
b)	from employees
c)	where salary > (select avg(salary)
d)	               from employees)
3.	查询各部门中工资比本部门平均工资高的员工的员工号, 姓名和工资
a)	select employee_id,last_name,salary
b)	from employees e1
c)	where salary > (
d)	               select avg(salary)
e)	               from employees e2
f)	               where e1.department_id = e2.department_id
g)	               group by department_id
h)	               )
4.	查询和姓名中包含字母u的员工在相同部门的员工的员工号和姓名
a)	select employee_id,last_name
b)	from employees
c)	where department_id in (
d)	                       select department_id
e)	                       from employees
f)	                       where last_name like '%u%'
g)	                        )
h)	and last_name not like '%u%'
5. 查询在部门的location_id为1700的部门工作的员工的员工号
select employee_id
from employees
where department_id in (select department_idfrom departmentswhere location_id = 1700)
6.查询管理者是King的员工姓名和工资
select last_name,salary
from employees
where manager_id in (select employee_idfrom employeeswhere last_name = 'King')