SQL笔试题：公司员工与部门查询

建表： DEPARTMENTS:DEPARTMENT_ID(primary key),DEPARTMENT_NAME,LOCATIONEMPLOYEES:EMPLOYEE_ID(primary key),EMPLOYEE_NAME,EMPLOYEE_JOB,MANAGER,SALARY,DEPARTMENT_ID 列出EMPLOYEES表中各部门的部门号，最高工资，最低工资 select max(SALARY) as 最高

建表：

DEPARTMENTS:
DEPARTMENT_ID(primary key),
DEPARTMENT_NAME,
LOCATION
EMPLOYEES:
EMPLOYEE_ID(primary key),
EMPLOYEE_NAME,
EMPLOYEE_JOB,
MANAGER,
SALARY,
DEPARTMENT_ID

1. 列出EMPLOYEES表中各部门的部门号，最高工资，最低工资

select max(SALARY) as 最高工资,min(SALARY) as 最低工资,DEPARTMENT_ID from EMPLOYEES group by DEPARTMENT_ID;

2. 列出EMPLOYEES表中各部门EMPLOYEE_JOB为'CLERK'的员工的最低工资，最高工资

select max(SALARY) as 最高工资,min(SALARY) as 最低工资,DEPARTMENT_ID as 部门号 from EMPLOYEES where EMPLOYEE_JOB = 'CLERK' group by DEPARTMENT_ID;

3. 对于EMPLOYEES中最低工资小于1000的部门，列出EMPLOYEE_JOB为'CLERK'的员工的部门号，最低工资，最高工资

select max(SALARY) as 最高工资,min(SALARY) as 最低工资,DEPARTMENT_ID as 部门号 from EMPLOYEES as b
where EMPLOYEE_JOB ='CLERK' and 1000>(select min(SALARY) from EMPLOYEES as a where a.DEPARTMENT_ID = b.DEPARTMENT_ID) group by b.DEPARTMENT_ID

4. 根据部门号由高而低，工资有低而高列出每个员工的姓名，部门号，工资

select DEPARTMENT_ID as 部门号,EMPLOYEE_NAME as 姓名,SALARY as 工资 from EMPLOYEES order by DEPARTMENT_ID desc,SALARY asc

5. 写出对上题的另一解决方法

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6. 列出'张三'所在部门中每个员工的姓名与部门号

select EMPLOYEE_NAME,DEPARTMENT_ID from EMPLOYEES where DEPARTMENT_ID = (select DEPARTMENT_ID from EMPLOYEES where EMPLOYEE_NAME = '张三')

7. 列出每个员工的姓名，工作，部门号，部门名

select EMPLOYEE_NAME,EMPLOYEE_JOB,EMPLOYEES.DEPARTMENT_ID,DEPARTMENTS.DEPARTMENT_NAME from EMPLOYEES,DEPARTMENTS where EMPLOYEES.DEPARTMENT_ID = DEPARTMENTS.DEPARTMENT_ID

8. 列出EMPLOYEES中工作为'CLERK'的员工的姓名，工作，部门号，部门名

select EMPLOYEE_NAME,EMPLOYEE_JOB,DEPARTMENTS.DEPARTMENT_ID,DEPARTMENT_NAME from EMPLOYEES,DEPARTMENTS where DEPARTMENTS.DEPARTMENT_ID = EMPLOYEES.DEPARTMENT_ID and DEPARTMENT_JOB = 'CLERK'

9. 对于EMPLOYEES中有管理者的员工，列出姓名，管理者姓名（管理者外键为MANAGER）

select a.EMPLOYEE_NAME as 姓名,b.EMPLOYEE_NAME as 管理者 from EMPLOYEES as a,EMPLOYEES as b where a.MANAGER is not null and a.MANAGER = b.EMPLOYEE_ID

10. 对于DEPARTMENTS表中，列出所有部门名，部门号，同时列出各部门工作为'CLERK'的员工名与工作

select DEPARTMENT_NAME as 部门名,DEPARTMENTS.DEPARTMENT_ID as 部门号,EMPLOYEE_NAME as 员工名,EMPLOYEE_JOB as 工作 from DEPARTMENTS,EMPLOYEES 
where DEPARTMENTS.DEPARTMENT_ID *= EMPLOYEES.DEPARTMENT_ID and EMPLOYEE_JOB = 'CLERK'

11. 对于工资高于本部门平均水平的员工，列出部门号，姓名，工资，按部门号排序

select a.DEPARTMENT_ID as 部门号,a.EMPLOYEE_NAME as 姓名,a.SALARY as 工资 from EMPLOYEES as a
where a.SALARY>(select avg(SALARY) from EMPLOYEES as b where a.DEPARTMENT_ID = b.DEPARTMENT_ID) order by a.DEPARTMENT_ID

12. 对于EMPLOYEES，列出各个部门中平均工资高于本部门平均水平的员工数和部门号，按部门号排序

select count(a.SALARY) as 员工数,a.DEPARTMENT_ID as 部门号 from EMPLOYEES as a
where a.SALARY>(select avg(SALARY) from EMPLOYEES as b where a.DEPARTMENT_ID = b.DEPARTMENT_ID) group by a.DEPARTMENT_ID order by a.DEPARTMENT_ID

13. 对于EMPLOYEES中工资高于本部门平均水平，人数多与1人的，列出部门号，人数，按部门号排序

select count(a.EMPLOYEE_ID) as 员工数,a.DEPARTMENT_ID as 部门号,avg(SALARY) as 平均工资 from EMPLOYEES as a
where (select count(c.EMPLOYEE_ID) from EMPLOYEES as c where c.DEPARTMENT_ID = a.DEPARTMENT_ID and c.SALARY>(select avg(SALARY) from EMPLOYEES as b where c.DEPARTMENT_ID = b.DEPARTMENT_ID))>1
group by a.DEPARTMENT_ID order by a.DEPARTMENT_ID

14. 对于EMPLOYEES中低于自己工资至少5人的员工，列出其部门号，姓名，工资，以及工资少于自己的人数

select a.DEPARTMENT_ID,a.EMPLOYEE_NAME,a.SALARY,(select count(b.EMPLOYEE_NAME) from EMPLOYEES as b where b.SALARY 5