How many types of keys in a table explain 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.

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.

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.

How many keys does a table have?

A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key. If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).