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 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,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_id
Select last_name||' '||first_name,job_id from employees where Manger_id is null;
8.选择公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||' '||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 st_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_id和90号部门的location_id
Select 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 , city
Select st_name , d.department_name , l.location_id , city from employees e,departments d,locations 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 st_name , e.job_id , d.department_id , d.department_name from employees e,departments d ,locations l where 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
Select e.employee_id "employees",st_name "Emp#",d.manager_id "Mgr#",st_name "manger" 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
Select e.department_id "Department_id", st_name "Last_name", st_name "colleague" from employees e join employees d on(d.department_id=e.department_id) where st_name<>st_name;
