--CREATE TABLE 表名称 --( --列名称1 数据类型, --列名称2 数据类型, --列名称3 数据类型, --.... --)
-- 创建一个职员表 --create table employee( --id int identity(1,1) primary key , --name varchar(50), --salary bigint, --deptid int);
select * from employee;
--添加字段: --alter table 表名 add 字段名 类型 --删除字段: --alter table 表名 drop column 字段名
--alter table employee add age int; --alter table employee drop column age;
--alter table employee add age int not null default 0 ;
--1.查出每个部门高于部门平均工资的员工名单 select employee.name from employee left join(select avg(salary)averg,deptid from employee group by deptid) s on employee.deptid=s.deptid where salary>averg;
select employee.name from employee,(select AVG(salary) aver,deptid from employee group by deptid)av where employee.deptid=av.deptid and employee.salary>av.aver;
--2、列出各个部门中工资高于本部门的平均工资的员工数和部门号,并按部门号排序。 select COUNT(employee.deptid)cou, employee.deptid from employee left join( select avg(salary)averg,deptid from employee group by deptid) s on employee.deptid=s.deptid where salary>averg group by employee.deptid;
select COUNT(employee.deptid)total,employee.deptid from employee ,(select AVG(salary)aver,deptid from employee group by deptid)av where employee.deptid=av.deptid and employee.salary>av.aver group by employee.deptid;
--3.求每个部门工资不小于6000的人员的平均值; select AVG(salary),deptid from employee where salary>=6000 group by deptid;
--4、各部门在各年龄段的平均工资 select AVG(salary),age from employee group by age;
--select * from employee;