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A super key is any set of attributes for which the values are guaranteed to be unique for all possible sets of tuples in a table at all times. It can be defined as a set of attributes of a relation schema upon which all attributes of the schema are functionally dependent. This means that a superkey may have some extra attribute which isn't necessary for uniquely identifying the rows in the table. A proper subset of a super key, which is also a super key is a candidate key.

Super keys are comparatively more in number than candidate keys.

There are comparatively less candidate keys in a relation. It is sometimes called the Windows key or system key. A super key is an attribute (s) that is used to uniquely identifies all attributes in a relation.

On the other hands, a super key that is a proper subset of another super key  is called candidate key. When you press the Super key, the Activities overview is displayed. Example: In the given Student Table we can have the following keys as the super key. Super key can be a single attribute or a set of attributes. A single attribute or a set of attributes that can uniquely identify all attributes of a particular relation is called Super key. Definition of Super Key in DBMS: A super key is a set of one or more attributes (columns), which can uniquely identify a row in a table. It is defined as a key that can identify all other attributes in a relation. In other words, when an attribute is removed from super key, it will no longer be a super key. It is a minimal super key. A candidate key is a closely related concept where the superkey is reduced to the minimum number of columns required to uniquely identify each row. All super keys can’t be candidate keys, but its reverse is true. The set of candidate keys form the base for selection of a single primary key. What is the Super key? A super key SK is a set of attributes that uniquely identifies the tuples of a relation. A single attribute or a set of attributes that uniquely identifies all attributes in a relation is super key. The set of super keys is verified to find candidate keys whereas, the set of the candidate keys is verified to select a single primary key. Why do we designate one of the candidate keys of a relation to be the primary key? A key K is an attribute or set of attributes that uniquely identifies the tuples of a relation. It satisfies the uniqueness constraint. There are comparatively more super keys in a relation. A particular candidate key … The set of super keys forms the base for selection of candidate keys.

It is not compulsory that all super keys will be candidate keys. This key can usually be found on the bottom-left of your keyboard, next to the Alt key, and usually has a Windows logo on it. A super key is a basic key of any relation. Your email address will not be published. A superkey or super-key is defined in the relational model of database organization as a set of attributes of a relation variable for which it holds that in all relations assigned to that variable, there are no two distinct tuples (rows) that have the same values for the attributes in this set.

A super key or simply key is a combination of all possible attribute which can uniquely identify the rows (tuples) in a table. Difference Between Primary and Candidate Key, Difference Between Primary key and Foreign key in DBMS, Difference Between Fact Table and Dimension Table, Difference Between Primary key and Unique key, Difference Between Logical and Physical Address in Operating System, Difference Between Preemptive and Non-Preemptive Scheduling in OS, Difference Between Synchronous and Asynchronous Transmission, Difference Between Paging and Segmentation in OS, Difference Between Internal and External fragmentation, Difference Between while and do-while Loop, Difference Between Pure ALOHA and Slotted ALOHA, Difference Between Recursion and Iteration, Difference Between Go-Back-N and Selective Repeat Protocol. Often DBMS beginners get confused between super key and candidate key, so we will also discuss candidate key and its relation with super key in this article. Two entities do not have the same values for the attributes that compose a super key. A superkey is a combination of columns that uniquely identifies any row within a relational database management system (RDBMS) table. Privacy. All candidate keys are super keys but the inverse is not true.

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