Computer Science for IGCSE & O level - Databases (Section 6 - No. 50)
What is the purpose of a 'constraint' in a database?
To increase the speed of queries.
To enforce rules and restrictions on data.
To create relationships between tables.
To store large amounts of data.
Giải thích
Constraints enforce rules to ensure that the data entered into the database is valid and adheres to defined rules.