Mysql _? Primary and Foregin key .

primary key

Uniqueness : (唯一獨特)

Availability :

e.g : which is not unqueness ? name  ,  name ID ,   e-mail ,  cell phone ,???  A:  name . explain : a lot people same name .  so it's not comfort Availability 

Foreign Key

Lab :

which is foreign key ? answer :  car_table of name for is foreign key . also foreign key is Primary key .