sql server 中常用修改列 ,创建主外键操作
作者:互联网
表结构
CREATE TABLE [staff] (
[id] [varchar](50) NOT NUL L,
[name] [varchar](50) NOT NULL,
[password] [varchar](50) NULL,
[roleid] [varchar](50) NULL,
[account] [varchar](50) NULL,
[tel] [varchar](50) NULL,
)
增加列 : alter table staff
add sex varchar(50)
修改列: alter table staff
alter column sex varchar(5) not null
创建主键 : alter table staff
add constraint pk_id primary key(id)
删除主键: alter table staff
drop constraint pk_id
创建外键: alter table staff
add constraint fk_roleid foreign key(roleid) references role(id)
删除外键:alter table staff
drop constraint fk_roleid
标签:varchar,50,server,sql,主外键,table,NULL,alter,staff 来源: https://www.cnblogs.com/Hikes/p/11592224.html