Database Management
primer-original-v2easySQLPrimary KeyConstraintsprimer-original-v2

Which constraints does a PRIMARY KEY automatically enforce?

Answer options

A
NOT NULL and UNIQUE
B
UNIQUE and CHECK
C
NOT NULL and DEFAULT
D
FOREIGN KEY and UNIQUE

Correct answer: NOT NULL and UNIQUE

Detailed Solution & Conceptual Analysis

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Key Engineering Takeaway

In Database Management, understanding the underlying mechanics of SQL is critical for writing performant, bug-free production code and passing rigorous technical architecture reviews.

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