What types of data integrity exist in database management systems?

In database management systems (DBMS), the main types of data integrity are:

• Entity Integrity — guarantees that each record in a table is unique and identified by a primary key that cannot be NULL.
• Referential Integrity — ensures the correctness of relationships between tables, e.g., a foreign key must reference an existing record or be NULL.
• Domain Integrity — restricts the values in columns to a specific data type, range, or set of allowed values.
• User-Defined Integrity — additional rules and constraints set by the user, such as triggers or checks.

These types of integrity help maintain data correctness and reliability in the database.