MySql(四) 任务
标签：rtm ble color font varchar sel null style sql
MySql(四) 任务
table employee(
id int not null,
name varchar(32) not null,
salary int not null,
departmentid int not null
);
insert into employee (id,name,salary,departmentid) values
(1,‘Joe‘,70000,1),
(2,‘Henry‘,80000,2),
(3,‘Sam‘,60000,2),
(4,‘Max‘,90000,1);
create table department(
id int not null,
name varchar(32) not null
);
insert into department(id,name) values
(1,‘IT‘),
(2,‘Sales‘);
select d.name as department, e.name, e.salary from empolyee e
join (select max(salary) as salary from employee group b departmentid)
as g on e.salary=g.salary
left join department d on e.departmentid=d.id;