Question

以下是我的EMPLOYEES表：

create table EMPLOYEES
    (EmpID    char(4)         unique Not null,
     Ename    varchar(10),
     Job      varchar(9),
     MGR      char(4),
     Hiredate date,
     Salary   decimal(7,2),
     Comm     decimal(7,2),
     DeptNo   char(2)         not null,
         Primary key(EmpID),
         Foreign key(DeptNo) REFERENCES DEPARTMENTS(DeptNo));


insert into EMPLOYEES values (7839,'King','President',null,'17-Nov-11',5000,null,10);
insert into EMPLOYEES values (7698,'Blake','Manager',7839,'01-May-11',2850,null,30);
insert into EMPLOYEES values (7782,'Clark','Manager',7839,'02-Jun-11',2450,null,10);
insert into EMPLOYEES values (7566,'Jones','Manager',7839,'02-Apr-11',2975,null,20);
insert into EMPLOYEES values (7654,'Martin','Salesman',7698,'28-Feb-12',1250,1400,30);
insert into EMPLOYEES values (7499,'Allen','Salesman',7698,'20-Feb-11',1600,300,30);
insert into EMPLOYEES values (7844,'Turner','Salesman',7698,'08-Sep-11',1500,0,30);
insert into EMPLOYEES values (7900,'James','Clerk',7698,'22-Feb-12',950,null,30);
insert into EMPLOYEES values (7521,'Ward','Salesman',7698,'22-Feb-12',1250,500,30);
insert into EMPLOYEES values (7902,'Ford','Analyst',7566,'03-Dec-11',3000,null,20);
insert into EMPLOYEES values (7369,'Smith','Clerk',7902,'17-Dec-10',800,null,20);
insert into EMPLOYEES values (7788,'Scott','Analyst',7566,'09-Dec-12',3000,null,20);
insert into EMPLOYEES values (7876,'Adams','Clerk',7788,'12-Jan-10',1100,null,20);
insert into EMPLOYEES values (7934,'Miller','Clerk',7782,'23-Jan-12',1300,null,10);

以下是我的DEPARTMENTS表：

create table DEPARTMENTS
(DeptNo   char(2)  unique Not null,
DName    varchar(14),
Location varchar(13),
Primary key(DeptNo));

insert into DEPARTMENTS values (10,'Accounting','New York');
insert into DEPARTMENTS values (20,'Research','Dallas');
insert into DEPARTMENTS Values (30,'Sales','Chicago');
insert into DEPARTMENTS values (40,'Operations','Boston');

以下是我的疑问：

select ename, salary
from EMPLOYEES
where Salary >
(select AVG(salary)
from EMPLOYEES);

Sql小提琴演示：http://www.sqlfiddle.com/#!3/61ca4/1

Answer 1

select e.ename,
       e.salary,
       d.DName
  from EMPLOYEES as e
      inner join DEPARTMENTS as d on e.DeptNo = d.DeptNo
where e.Salary > (select AVG(salary) from EMPLOYEES);

Sql小提琴演示：http://www.sqlfiddle.com/#!3/61ca4/2

Answer 2

select E.ename, E.salary, D.DName

from Employees E, Departments D

where E.Deptno = D.Deptno

And Salary > (select AVG(salary) from EMPLOYEES);

如何在结果中列出另一个表中的部门名称？

2 个答案: