Super Key

Difference between candidate key and primary key ?

If possible tell me the difference among Primary , super , candidate , minimal super key ( and other keys if there exists something else )

Thanks in advance

OK I will tell you one by one all keys

"Super Key" : Different set of attributes which are able to identify any row in the database is known as super key.

"Candidate Key" : "minimal super key" is termed as candidate key i.e. among set of super keys one with minimum number of attributes.

i.e. candidate key & minimal super key are the same.

"Primary Key" : Primary key is any attribute which is able to uniquely identify a specific row in the database.

"Foreign Key" : A foreign key is a field in a relational table that matches the primary key of another table. The foreign key can be used to cross-reference tables.

These are the basic keys used in RDBMS.

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