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Database Constraints

Quick Summary & Key Takeaways

• Subject Focus: DBMS Notes in English (BCA / B.Tech Syllabus)
• Core Topic: Database Constraints - General Topics
• Overview: Constraints in DBMS: Constraints are rules enforced on data columns in a table to ensure the accuracy, reliability, and integrity of the data. They pre...
• Key Concepts: Database constraints, Primary foreign key unique check Hindi, Constraints types,

Constraints in DBMS:

Constraints are rules enforced on data columns in a table to ensure the accuracy, reliability, and integrity of the data. They prevent the entry of invalid data into the database.

Types of Constraints:

NOT NULL: Ensures that a column cannot have a NULL value.
UNIQUE: Ensures that all values in a column are different.
PRIMARY KEY: A combination of a NOT NULL and UNIQUE constraint. It uniquely identifies each record in a table. A table can have only one primary key.
FOREIGN KEY: Uniquely identifies a row/record in another table. It is used to link two tables together and ensures referential integrity.
CHECK: Ensures that all values in a column satisfy a specific condition.
DEFAULT: Sets a default value for a column when no value is specified.

Frequently Asked Questions (FAQs)

Constraints in DBMS: Constraints are rules enforced on data columns in a table to ensure the accuracy, reliability, and integrity of the data.

Understanding Database Constraints is fundamental to mastering DBMS Notes in English. It covers crucial concepts, solved problems, and revision points essential for academic and entrance exam success.

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