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第11章 SQL练习答案

2022-10-25 来源:榕意旅游网
1.实训题

根据人力资源管理系统数据库中数据信息,完成下列操作。

(1) 查询100号部门的所有员工信息。

Selsect * from employees where department_id = 100

(2) 查询所有职位编号为“SA_MAN”的员工的员工号、员工名和部门号。

Select employee_id,first_name,last_name,department_id from employees where job_id= ‘SA_MAN’

(3) 查询每个员工的员工号、工资、奖金以及工资与奖金的和。

Select employee_id,salary,commission_pct,

salary*(1+nvl(commission_pct,0) from employees

(4) 查询40号部门中职位编号为“AD_ASST”和20号部门中职位编号为“SA_REP”的员工的信息。

Select * from employees where department_id=40 and job_id=’ AD_ASST’ OR department_id=20 and job_id=’ SA_REP’;

(5) 查询所有职位名称不是“Stock Manager”和“Purchasing Manager”,且工

资大于或等于2000的员工的详细信息。

Select * from employees where job_id not in(’ Stock Manager’,’ Purchasing Manager’) and salary>=2000

(6) 查询有奖金的员工的不同职位编号和名称。

Select distinct job_id, job_title from jobs where job_id in (select job_id from employees where job_id is not null)

(7) 查询没有奖金或奖金低于100元的员工信息。

Select * from employees where salary*commission_pct<100 or commission is NULL

(8) 查询员工名(first_name)中不包含字母“S”的员工。

Select first_name from employees where first_name not like ‘%S%’

(9) 查询员工的姓名和入职日期,并按入职日期从先到后进行排序。

Select first_name,last_name,hire_date from employees order by hire_date;

(10) 显示所有员工的姓名、职位、工资和奖金,按职位降序排序,若职位相同则按工资升序排序。

Select first_name,last_name,job_id,salary ,salary*commission_pet from employees order by job_id desc ,salary asc;

(11) 查询所有员工的姓名及其直接上级的姓名。

Select a.first_name,b.first_name from employees a join employees b on b.employee_id = a.manage_id

(12) 查询入职日期早于其直接上级领导的所有员工信息。

(13) select * from employees a where hire_date<(select hire_date from employees b b.employee_id=a.manage_id)

(14) 查询各个部门号、部门名称、部门所在地以及部门领导的姓名。

Select d.department_id,d.department_name,d.location,e.first_name from departments d join employees e

on d.manager_id=e.employee_id

(15) 查询所有部门及其员工信息,包括那些没有员工的部门。

Select department_name,first_name from departments d left join employees e on d.deparment_id=e.department_id

(16) 查询所有员工及其部门信息,包括那些还不属于任何部门的员工。

Select e.first_name,d.department_name

From employees left join departments on e.department_id=d.department_id;

(17) 查询所有员工的员工号、员工名、部门名称、职位名称、工资和奖金。

Select

e.employee_id,e.first_name,d.department_name,j.job_title,e.salary,e.salary*e.commission_pct 奖金

From departments d join employees e on d.department_id=e.department_id

Join jobs j on j.job_id=e.job_id;

(18) 查询至少有一个员工的部门信息。

Select distinct departments.* from departments d join employees e

on e.employee_id is not null;

select * from employees where department_id in(select distinct department_id from employees)

select * from departments d where exists(select 1 from employees

where department_id=d.department_id)

(19) 查询工资比100号员工工资高的所有员工信息。

Select * from employees where salary>(select salary from employees where employee_id = 100);

(20) 查询工资高于公司平均工资的所有员工信息。

Select * from employees where salary>(select avg(salary) from employees)

(21) 查询各个部门中不同职位的最高工资。

Select job_id,max(salary) from employees group by job_id

(22) 查询各个部门的人数及平均工资

Select department_id,count(*),avg(salary ) from employees

group by department_id;

(23) 统计各个职位的员工人数与平均工资。

Select job_id ,count(employee_id),avg(salary)

from employees

group by job_id;

(24) 统计每个部门中各职位的人数与平均工资。

Select department_id,job_id,count(*),avg(salary) from employees group by department_id,job_id;

(25) 查询最低工资大于5000元的各种工作。

Select job_id,job_title from jobs where job_id in(

Select job_id from employees group by job_id having min(salary)>5000);

(26) 查询平均工资低于6000元的部门及其员工信息。

Select e.*,d.* from employees e join departments d on e.department_id=d.department_id and

department_id in(select department_Id from employees group by employee_id having avg(salary)<6000);

(27) 查询在“Sales”部门工作的员工的姓名信息。

Select e.first_name||e.last_name from employees e join departments d on e.department_id=d.department_id where d.department_name = ‘Sales’;

Select * from employee where department_id in(select department_d from departments where department_name=’Sales’)

(28) 查询与140号员工从事相同工作的所有员工信息。

Select * from employees where job_id in (select job_id from employees where employee_id = 140);

(29) 查询工资高于30号部门中所有员工的工资的员工姓名和工资。

Select first_name,last_name,salary from employees where salary>(select max(salary) from employees deparment_id=30);

(30) 查询每个部门中的员工数量、平均工资和平均工作年限。

Select count(*),avg(salary),avg(round((sysdate-hire_date)/365)) from employees group by department_id

(31) 查询工资为某个部门平均工资的员工的信息。

Select * from employees where salsry in(select avg(Salary) from employees group by department_id)

(32) 查询工资高于本部门平均工资的员工的信息。

Select * from employees e1 where salary>(select avg(salary) from employees

e2 where e2.department_id=e1.department_id )

(33) 查询工资高于本部门平均工资的员工的信息及其部门的平均工资。

Select e.*,avgsal

From employees e join (select department_id,avg(salary) avgsal from employees group by department_id) d

On e.department_id=d.department_id

And e.salary>d.avgsal

(34) 查询工资高于50号部门某个员工工资的员工的信息。

Select *from employees where salary>any(select salary from employees where department_id=50):

(35) 查询工资、奖金与10号部门某员工工资、奖金都相同的员工的信息。

Select * from employees where (salary,nvl(commission_pct) ) in(

Select salary,nvl(commission_pct) from employees where department_id=10

)

(36) 查询部门人数大于10的部门的员工信息。

Select * from employees where department_id in(select department_id from employees group by department_id having count(*)>10);

查询所有员工工资都大于10000元的部门的信息

Select * from department where department_id in (select department_id from employees group by department_id having min(salary)>10000)

(37) 查询所有员工工资都大于5000元的部门的信息及其员工信息。

(38) 查询所有员工工资都在4000元~8000元之间的部门的信息。

Select * from departments where department_id in(

Select department_id from employees group by department_id having min(salary)>=4000 and max(salary)<=8000)

(39) 查询人数最多的部门信息。

Select * from department_id where department_id in(

Select department_id from employees group by department_id having

Count(*)>=all(

select count(*) from employees group by department_id )

)

(40) 查询30号部门中工资排序前3名的员工信息。

Select * from employee where department_id=30 and salary is not null and rownum<=3 order by salary desc

(41) 查询所有员工中工资排序在5~10名之间的员工信息。

Select * from

(

Select rownum rn,employee_id,salary from (

Select employee_id,salary from employees where salary is not null order by salary desc) e1

)e2

Where rn between 5 and 10

(42) 向employees表中插入一条记录,员工号为1000元,入职日期为2002年5月10日,email为example@neusoft.edu.cn,其他信息与员工号为150的员工相同。

(43) 将各部门员工的工资修改为该员工所在部门平均工资加1000。

(44) 查询各月倒数第2天入职的员工信息。

(45) 查询工龄大于或等于10年的员工信息。

(46) 查询员工信息,要求以首字母大写的方式显示所有员工姓(last_name)和员工名(first_name)。

(47) 查询员工名(first_name)正好为6个字符的员工的信息。

(48) 查询员工名(first_name)的第2个字母为“M”的员工信息。

(49) 查询所有员工名(first_name),如果包含字母“s”,则用“S”替换。

(50) 查询在2月份入职的所有员工信息。

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