SQL -- 简单语句学习总结7条

/**1.Create table guestbook**/

--if object_id('guestbook') is  null

--CREATE TABLE guestbook (id int PRIMARY KEY, visitor VARCHAR(40),comments TEXT,entrydate DATETIME)

/**2.Insert data into table guestbook**/

--insert into guestbook values(3,'a','123','2016-05-12')

--insert into guestbook values(4,'a','1234','2016-05-12')

--insert into guestbook values(5,'a','12345','2016-05-12')

/**3.Drop table guestbook**/

--if object_id('guestbook') is not null

--drop table guestbook

--if exists(select * from sysobjects where name='guestbook')

--drop table guestbook

/**4.Update table guestbook**/

--update guestbook set visitor='b' where id='4'

/**5.select all record**/

--select * from guestbook

/**6.Delete data (one record) from table guestbook**/

--delete guestbook where id='3'

/**7.Truncate table guestbook (delete all datas from table guestbook)**/

--truncate table guestbook