oracle习题及答案

1、1. 查询工资大于12000的员工姓名和工资Select last_name|' '|first_name,salary from employees where salary >12000;2. 查询员工号为176的员工的姓名和部门号Select last_name|' '|first_name,department_id from employees where employee_id=176;3. 选择工资不在5000到12000的员工的姓名和工资Select last_name|' '|first_name,salary from

2、employees where salary not between 5000 and 12000;4. 选择雇用时间在1998-02-01到1998-05-01之间的员工姓名，job_id和雇用时间Select last_name|' '|first_name,job_id,hire_date from employees where hire_date between '1-2月-98' and '1-5月-98'5. 选择在20或50号部门工作的员工姓名和部门号Select last_name|' '|first_name,

3、department_id from employees where department_id in (20,50);6. 选择在1994年雇用的员工的姓名和雇用时间Select last_name|' '|first_name,hire_date from employees where hire_date like '%94'7. 选择公司中没有管理者的员工姓名及job_idSelect last_name|' '|first_name,job_id from employees where Manger_id is null;8. 选择公

4、司中有奖金的员工姓名，工资和奖金Select last_name|' '|first_name,salary,commission_pct from employees where commission_pct is not null;9. 选择员工姓名的第三个字母是a的员工姓名Select last_name|' '|first_name from employees where last_name|' '|first_name like '_a%'10. 选择姓名中有字母a和e的员工姓名Select last_name|

5、9; '|first_name from employees where last_name|first_name like '%a%e%' or last_name|first_name like '%e%a%' 多表查询11. 显示所有员工的姓名，部门号和部门名称。Select e.last_name,d.department_id,d.department_name from employees e , departments d where (e.department_id=d.department_id); 12. 查询90号部门员工的job_

6、id和90号部门的location_idSelect e.job_id,d.location_id from employees e, departments d where e.department_id=d.deparement_id and d.department_id=90;13. 选择所有有奖金的员工的last_name , department_name , location_id , citySelect e.last_name , d.department_name , l.location_id , city from employees e,departments d,l

7、ocations l where e.department_id=d.department_id AND d.location_id=l.location_id AND commission_pct is not null;14. 选择在Toronto工作的员工的last_name , job_id , department_id , department_name Select e.last_name , e.job_id , d.department_id , d.department_name from employees e,departments d ,locations l whe

8、re e.department_id=d.department_id AND d.location_id=l.location_id AND l.city='Toronto'15. 选择所有员工的姓名，员工号，以及他的管理者的姓名和员工号，结果类似于下面的格式employeesEmp#managerMgr#kochhar101king100Select e.employee_id "employees",e.last_name "Emp#",d.manager_id "Mgr#",d.last_name "m

9、anger" from employees e,employees d where e.manager_id=d.employee_id(+);6. 查询各部门员工姓名和他们的同事姓名，结果类似于下面的格式Department_idLast_namecolleague20fayhartsteinSelect e.department_id "Department_id", d.last_name "Last_name", e.last_name "colleague" from employees e join employ

10、ees d on(d.department_id=e.department_id) where d.last_name<>e.last_name; 分组查询16. 组函数处理多行返回一行（true）17. 组函数不计算空值（ false）18. where子句在分组之前对检索进行过滤 ( true)19. 查询公司员工工资的最大值，最小值，平均值，总和Select max(salary),min(salary),avg(salary),sum(salary) from employees;20. 查询各job_id的员工工资的最大值，最小值，平均值，总和Select max(sal

11、ary),min(salary),avg(salary),sum(salary) from employees group by job_id;21. 选择具有各个job_id的员工人数Select job_id,count(*) from employees group by job_id;22. 查询员工最高工资和最低工资的差距（DIFFERENCE）Select max(salary)-min(salary) "DIFFERENCE" from employees;23. 查询各个管理者手下员工的最低工资，其中最低工资不能低于6000，没有管理者的员工不计算在内Sel

12、ect manager_id,min(salary) from employees where manager_id is not null group by manager_id having min(salary) >=6000;24. 查询所有部门的名字，location_id，员工数量和工资平均值Select d.department_name,d.location_id,count(e.employee_id),avg(e.salary) from employees e,departments d where e.department_id(+)=d.department_i

13、d group by d.location_id,d.department_name;25. 查询公司的人数，以及在1995-1998年之间，每年雇用的人数，结果类似下面的格式total1995199619971998303467Select count(employee_id),to_char(hire_date,'yyyy') "y"count(*) from employees where to_char(hire_date,'yyyy') between 1995 and 1998 group by to_char(hire_date

14、,'yyyy') order by y;Select 子查询26. 查询和zlotkey相同部门的员工姓名和雇用日期Select last_name,hire_date,department_id from employees where department_id=(select department_id from employees where lower(last_name)='zlotkey') ;27. 查询工资比公司平均工资高的员工的员工号，姓名和工资。Select employee_id,last_name,salary from employe

15、es where salary>(select avg(salary) from employees );28. 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Select employee_id,last_name,department_id from employees where department_id =any (select department_id from employees where lower(last_name) like '%u%');29. 查询在部门的location_id为1700的部门工作的员工的员工号，departmen

16、t_id和job_idSelect employee_id,department_id,job_id from employees where department_id = any (select department_id from departments where location_id=1700);30. 查询管理者是king的员工姓名和工资Select last_name,salary from employees where manager_id=(select employee_id from employees where last_name='King');

17、 创建和管理表31. 创建表deptnameNull?typeidNumber(7)nameVarchar2(25)Create table dept ( id Number(7),name varchar(25);32. 将表departments中的数据插入表dept中Insert into dept( SELECT department_id, department_name FROM departments);33. 创建表empnameNull?typeidNumber(7)First_nameVarchar2(25)Last_nameVarchar2(25)Dept_idNumbe

18、r(7)Create table emp (id Number(7),First_name varchar(25),Last_name varchar(25),Dept_id number(7);34. 将列Last_name的长度增加到50Alter table emp modify (last_name varchar2(50); 35. 查询数据字典视图user_tables检查刚才的操作Select * from user_tables;36. 根据表employees创建employees2Create table employees2 asselect * from employe

19、es;37. 删除表empDrop table emp;38. 将表employees2重命名为empRename employees2 to emp;39. 在表dept和emp中添加新列test_column，并检查所作的操作Alter table emp add(test_column varchar(10); 单行函数40. 显示系统时间Select to_char(sysdate 'DD-MON-YYYY')from dual;41. 查询员工号，姓名，工资，以及工资提高百分之20%后的结果（new salary）Select employee_id,last_nam

20、e|' '|first_name,salary,salary*1.2 newsalary from employees;42. 将员工的姓名按首字母排序，并写出姓名的长度（length）Select last_name,length(last_name) from employees order by substr(last_name,1,1) desc;43. 查询各员工的姓名，并显示出各员工在公司工作的月份数（worked_month）。Select last_name|" '|first_name,months_between(sysdate,hire_

21、date) worked_month from employees;44. 查询员工的姓名和工资，按下面的形式显示Last_nameSALARYking$24000Select lower(last_name) "last_name",lpad(salary,15,'$') "Salary" from employees;45. 查询员工的姓名，以及在公司工作的月份数（worked_month），并按月份数降序排列Select last_name|' '|first_name,months_between(sysdate,

22、hire_date) worked_month from employees order by worked_month desc;46. 做一个查询，产生下面的结果<last_name> earns <salary> monthly but wants <salary*3>Dream SalaryKing earns $24000 monthly but wants $72000Select 'King'|' earns '|lpad(salary,6,'$')|' monthly but wants

23、 '|lpad(salary*3,6,'$') "Dream Salary" from employees;47. 做一个查询，产生下面的结果add_month(6)+4Last_nameHire_datereiewking17-jun-87Monday,the twenty-first of December , 1987Select lower(last_name) "Last_name",hire_date,to_char(add_months(hire_date,6)+4,'DAY,MONTH,YYYY') "Hire_date " from employees where last_name like 'King'9做一个查询，产生下面的结果Employees_and_their_salarysKing*