1.查询工资大于12000的员工姓名和工资
select last_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, 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, salary
from 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, job_id, hire_date
from employees
where hire_date between '1-2月 -1998' and '1-5月 -1998'
5.选择在20或50号部门工作的员工姓名和部门号
select last_name, 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, 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_id
select last_name, job_id
from employees
where manager_id is null
8.选择公司中有奖金的员工姓名，工资和奖金级别
select last_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
from employees
where last_name like '__a%'
10.选择姓名中有字母a和e的员工姓名
select last_name
from employees
where last_name like '%a%' and last_name like '%e%'
11.显示系统时间
select to_char(sysdate, 'yyyy-mm-dd hh:mi:ss') from dual;
12.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_name, salary, salary * 1.2 "new salary"
from employees;
13.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 last_name
14.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, months_between(sysdate, hire_date) worked_month
from employees
15.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, months_between(sysdate, hire_date) worked_month
from employees
order by worked_month desc
16.做一个查询，产生下面的结果
<last_name> earns <salary> monthly but wants <salary*3>
Dream Salary
King earns $24000 monthly but wants $72000
select last_name || ' earns ' || salary || ' monthly but wants ' || salary * 3
from employees
17.使用decode函数，按照下面的条件：
job grade
AD_PRES A
ST_MAN B
IT_PROG C
SA_REP D
ST_CLERK E
Others F
产生下面的结果
Last_name |
|
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