sql server语句问题

PRIMARY KEY CLUSTERED
(
[ReaderId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
该语句中的约束性条件的解释

把字段ReaderId设置为主键，升序存放，允许行锁，允许页锁，不允许重复键值。