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DBMS Integrity Constraints MCQs
Relational tables can include ___ primary keys
21. Relational tables can include ___ primary keys.
- Only 1
- Only 2
- More than 2
- As many as you want
Answer: A) Only 1
Explanation:
Primary keys are always unique, it is used to identify the result uniquely and there is always one column in a table that can be marked as a primary key.