What is mean by keys and explain its types with example?

What are the types of key explain with example?

Let's look at each of them separately.Primary Key. If you're wondering what is primary key in DBMS, primary key is a column of a table or a set of columns that helps to identify every record present in that table uniquely. ... Super Key. ... Candidate Key. ... Alternate Key. ... Foreign Key. ... Composite Key. ... Unique Key.

What are the types of keys?

Types of keys:Primary key. It is the first key used to identify one and only one instance of an entity uniquely. ... Candidate key. A candidate key is an attribute or set of attributes that can uniquely identify a tuple. ... Super Key. ... Foreign key. ... Alternate key. ... Composite key. ... Artificial key.

What do you mean by keys?

1a : a usually metal instrument by which the bolt of a lock is turned. b : any of various devices having the form or function of such a key a key for winding a clock. 2a : a means of gaining or preventing entrance, possession, or control. b : an instrumental or deciding factor the key to her success.

How many types of key are there?

The five types of keys on a keyboard are alphabet keys, number keys, special keys, function keys, and navigation keys.