Is the note for 'Database Constraints' free to read?

Yes, NotesMedia provides free access to 'Database Constraints' notes for BCA / B.Tech preparation online.

Does this cover the syllabus for DBMS Notes in English?

Yes, this chapter covers key concepts of 'Database Constraints' under the DBMS Notes in English syllabus for BCA / B.Tech.

How long does it take to read 'Database Constraints'?

This note is approximately a 10-minute read.

Database Constraints - (BCA / B.Tech)

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.

Database Constraints

Constraints in DBMS:

In this Chapter