關於員工與部門查詢的SQL筆試題

DEPARTMENTS:

DEPARTMENT_ID(primary key),

DEPARTMENT_NAME,

LOCATION

//新建一張表

create table DEPARTMENTS

(

DEPARTMENT_ID int Primary key,

DEPARTMENT_NAME varchar(255)

)

EMPLOYEES:

EMPLOYEE_ID(primary key),

EMPLOYEE_NAME,

EMPLOYEE_JOB,

MANAGER,

SALARY,

DEPARTMENT_ID

//新建一張表

create table EMPLOYEES
(
EMPLOYEES_ID int Primary key,
EMPLOYEES_NAME varchar(255),
EMPLOYEES_JOB varchar(255),
MANAGER varchar(255),
SALARY money ,
DEPARTMENT_ID int
)

1. 列出EMPLOYEES表中各部門的部門號，最高工資，最低工資

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

   
   
2. 列出EMPLOYEES表中各部門EMPLOYEE_JOB爲'CLERK'的員工的最低工資，最高工資

   select max(SALARY) as 最高工資,min(SALARY) as 最低工資,DEPARTMENT_ID as 部門號 from EMPLOYEES where EMPLOYEE_JOB = 'CLERK' group by DEPARTMENT_ID;

   
   
3. 對於EMPLOYEES中最低工資小於1000的部門，列出EMPLOYEE_JOB爲'CLERK'的員工的部門號，最低工資，最高工資

   select max(SALARY) as 最高工資,min(SALARY) as 最低工資,DEPARTMENT_ID as 部門號 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. 根據部門號由高而低，工資有低而高列出每個員工的姓名，部門號，工資

   select DEPARTMENT_ID as 部門號,EMPLOYEE_NAME as 姓名,SALARY as 工資 from EMPLOYEES order by DEPARTMENT_ID desc,SALARY asc

   
   
5. 列出'張三'所在部門中每個員工的姓名與部門號

   select EMPLOYEE_NAME,DEPARTMENT_ID from EMPLOYEES where DEPARTMENT_ID = (select DEPARTMENT_ID from EMPLOYEES where EMPLOYEE_NAME = '張三')

   
   
6. 列出每個員工的姓名，工作，部門號，部門名

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

   
   
7. 列出EMPLOYEES中工作爲'CLERK'的員工的姓名，工作，部門號，部門名

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

   
   
8. 對於EMPLOYEES中有管理者的員工，列出姓名，管理者姓名（管理者外鍵爲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

   
   
9. 對於DEPARTMENTS表中，列出所有部門名，部門號，同時列出各部門工作爲'CLERK'的員工名與工作

   select DEPARTMENT_NAME as 部門名,DEPARTMENTS.DEPARTMENT_ID as 部門號,EMPLOYEE_NAME as 員工名,EMPLOYEE_JOB as 工作 from DEPARTMENTS,EMPLOYEES
   where DEPARTMENTS.DEPARTMENT_ID *= EMPLOYEES.DEPARTMENT_ID and EMPLOYEE_JOB = 'CLERK'

   
   
10. 對於工資高於本部門平均水平的員工，列出部門號，姓名，工資，按部門號排序

    select a.DEPARTMENT_ID as 部門號,a.EMPLOYEE_NAME as 姓名,a.SALARY as 工資 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

    
    
11. 對於EMPLOYEES，列出各個部門中平均工資高於本部門平均水平的員工數和部門號，按部門號排序

    select count(a.SALARY) as 員工數,a.DEPARTMENT_ID as 部門號 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

    
    
12. 對於EMPLOYEES中工資高於本部門平均水平，人數多與1人的，列出部門號，人數，按部門號排序

    select count(a.EMPLOYEE_ID) as 員工數,a.DEPARTMENT_ID as 部門號,avg(SALARY) as 平均工資 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

    
    
13. 對於EMPLOYEES中低於自己工資至少5人的員工，列出其部門號，姓名，工資，以及工資少於自己的人數

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