Answer
A primary key uniquely identifies each row. It ensures uniqueness, improves indexing, and maintains reliable data integrity.
Quick Answer
A primary key uniquely identifies each row in a table — no two rows can have the same value, and it can't be NULL. It's the anchor for relationships between tables and speeds up lookups. Without it, finding or linking a specific record becomes messy and unreliable.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ