What is cardinality in database design?
Cardinality refers to the uniqueness of data values in a database table. It defines the relationship between tables.
Can you explain the different types of cardinality?
Sure! The main types are one-to-one, one-to-many, and many-to-many. Each defines how records in one table relate to records in another.
How does cardinality affect database performance?
High cardinality can improve performance by allowing for more efficient indexing, while low cardinality may lead to slower queries.
What are some examples of cardinality in real-world applications?
In a school database, a student can enroll in many courses (one-to-many), while each course can have many students (many-to-many).
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