sql - 如何在我的结果中列出另一个表格中的部门名称？

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');

以下是我的查询：

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

score 2 · Accepted Answer

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

score 0 · Accepted Answer

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

from Employees E, Departments D

where E.Deptno = D.Deptno

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

sql - 如何在我的结果中列出另一个表格中的部门名称？

2 回答 2

Related

Reference