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Anonymous Asked in Cars &Transportation · 2 weeks ago

What is key explain different types of keys?

Contents
  1. What are different types of keys?
  2. What are keys?
A key refers to an attribute/a set of attributes that help us identify a row (or tuple) uniquely in a table (or relation). A key is also used when we want to establish relationships between the different columns and tables of a relational database.


What are different 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 are keys?

A key is a field, or combination of fields, in a database table used to retrieve and sort rows in the table based on certain requirements. Keys are defined to speed up access to data and, in many cases, to create links between different tables.

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