1.创建/删除表
-------------
创建表
create table MyUserTable
(
UserID INTEGER CONSTRAINT MyPK PRIMARY KEY ,
UserName Text,
UserBirthday DATETIME
)
删除表
DROP TABLE myUserTalbe
2.创建/删除主键
---------------
创建主键
ALTER TABLE MyUserTable ADD CONSTRAINT MyPK PRIMARY KEY(UserID)
ALTER TABLE MyUserTable ADD CONSTRAINT MyPK PRIMARY KEY(UserID,UserName)
删除主键
ALTER TABLE MyUserTable Drop CONSTRAINT MyPK
3.增加/修改/删除栏位字段
--------------------------
增加栏位字段
ALTER TABLE MyUserTable
ADD COLUMN UserNotes Text(20)
修改栏位字段
ALTER TABLE MyUserTable
ALTER COLUMN UserNotes char(100)
删除栏位字段
ALTER TABLE MyUserTable
DROP COLUMN UserNotes