What is difference between a super key, a key, a
candidate key and a primary key?

• super key has properties of uniqueness but not necessarily irreducability
  a key is a aatribute or set of attributes of a relation that uniquely associate an entity
  candidate has properties of uniqueness and irreducability
  primary key is any candidate key that associates an entity
• 9 years agoHelpfull: Yes(0) No(0)