0 votes 0 votes Foreign key does not depend on cardinality only but primary key only depend on cardinality . what does it mean please explain with example.. pream sagar asked May 13, 2018 pream sagar 151 views answer comment Share Follow See 1 comment See all 1 1 comment reply Prateek Raghuvanshi commented May 13, 2018 reply Follow Share Foreign key does not have it's own elements ,it contains elements of primary key where foreign key is referencing,a nd also foreign key can have null,repeated elments of primary key. Primary key contains only unique elements ,no reparation,no null so cardinality does matter for primary key. 0 votes 0 votes Please log in or register to add a comment.