本文转自:http://blog.chinaunix.net/uid-17079336-id-2832443.html 1.创建表的同时创建主键约束(1)无命名create table student (studentid int primary key not null,studentname varchar(8),age int);(2)有命名create table students (studentid int ,studentname varchar(8),age int,constr…
CREATE or REPLACE view view_will as select college.collegeid,mat.stuid,sum(score.chinese+score.math+score.english+score.complex)from college,mat,scorewhere college.collegeid=mat.first_will and mat.stuid=score.stuidgroup by SCORE.STUID,COLLEGE.COLL…
create table test( id int not null primary key, name varchar2(20), sex int) ; create sequence t ->创建squence,命名为t minvalue 1 ->最小值 maxvalue 100000 ->最大值 start with 1 ->从1开始 increment by 1 ->增长比例 nocache ->增长池,为了提高效率,可以设置为 cache 10 ; inser…
使用: ROW_NUMBER() over(order by ID desc) insert into dbo.Aa(Name,Nums) select top 10 NickName,ROW_NUMBER() over(order by ID desc) as Nums from td_UserInfo 插入后,Nums的字段就是从1开始的自增数字.…
