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Keys in DBMS and Their Types - DBMS Notes in English Notes

Quick Summary & Key Takeaways

• Subject Focus: DBMS Notes in English (BCA / B.Tech Syllabus)

• Core Topic: Keys in DBMS and Their Types - General Topics

• Overview: Keys & Their Types in DBMS: Keys are a crucial part of a relational database. They are attributes or a set of attributes that help you to uniquely iden...

• Key Concepts: DBMS keys types, Super candidate primary foreign composite Hindi, Key examples,

Keys & Their Types in DBMS:

Keys are a crucial part of a relational database. They are attributes or a set of attributes that help you to uniquely identify a row (tuple) in a table and establish relationships between tables.

Types of Keys:

Super Key: A set of one or more attributes that can uniquely identify a record in a table.
Candidate Key: A minimal super key, meaning it's a super key with no redundant attributes. A table can have multiple candidate keys.
Primary Key: A candidate key chosen by the database designer to uniquely identify records in a table. It cannot have NULL values. Each table can have only one primary key.
Foreign Key: An attribute in one table that refers to the primary key of another table. It is used to link two tables.
Alternate Key: The candidate keys that are not chosen as the primary key.
Composite Key: A primary key that consists of two or more attributes that together uniquely identify a record.
Surrogate Key: An artificial key created by the system (often an auto-incrementing integer) to act as a primary key, especially when no natural candidate key exists.

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Keys & Their Types in DBMS: Keys are a crucial part of a relational database.

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Keys in DBMS and Their Types

Quick Summary & Key Takeaways

Keys & Their Types in DBMS:

Frequently Asked Questions (FAQs)

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