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What are the different types of keys in SQL?

Contents
  1. What are the different types of keys?
  2. What are the 5 types of primary key?
  3. What are the four main types of keys?
  4. What are the two types of keys?
Practically in the database, we have only three types of keys Primary Key, Unique Key, and Foreign Key. 28 апр. 2022 г.


What are the different types of keys?

Primary Key. The primary key refers to a column or a set of columns of a table that helps us identify all the records uniquely present in that table. ... Super Key. ... Candidate Key. ... Alternate Key. ... Foreign Key. ... Composite Key. ... Unique Key.

What are the 5 types of primary key?

Primary Key.Candidate Key.Alternate Key.Super Key.Composite Key.Foreign Key.Unique Key.

What are the four main types of keys?

How the keys are organizedTyping (alphanumeric) keys. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter.Control keys. These keys are used alone or in combination with other keys to perform certain actions. ... Function keys. ... Navigation keys. ... Numeric keypad.

What are the two types of keys?

Types of KeysSkeleton Key. Also known as a passkey, a skeleton key is a simple key with a cylindrical shaft and a single toothed end, which is used to open warded locks. ... Abloy Key. The Abloy key is used on disc tumbler locks. ... Dimple Key. ... Paracentric Key. ... Tubular Key. ... Keycard.

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