adminname varchar (50) not null这句以后的代码是什么意思？做什么用的？SQL里面的内容。。求大神解答~

create table admin
adminpassword varchar (50) not null,
adminname varchar (50) not null,
constraint pk_admin primary key clustered
(adminname asc
)with(pad_index=off,
statistics_norecompute=off,
ignore_dup_key=off,
allow_row_locks=on,
allow_pages_locks=on)
on primary
on primary

这是主键约束。就是说该表中adminname列不允许出现重复。

可以私聊我~