这个实例里面的表结构参见《建表，插入标识列，自动生成id》一文http://www.2cto.com/database/201503/385727.html

use yuyongTest


insert into student (name,info)
values('qwe','qwe');




insert into student (name,info)
values('hhh','hhh'),
('iii','iii'),
('jjj','jjj');


select * from student;
--对于包含标识列的表, @@IDENTITY总是返回标识列值的最大者
select @@IDENTITY;
delete from student where number>20
--@@rowcount;返回其紧邻的上一句SQL语句影响的行数
select @@rowcount;

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