Answer
AUTO_INCREMENT automatically generates sequential numeric values, commonly used for primary key columns.
Quick Answer
AUTO_INCREMENT automatically generates a unique incrementing integer value for a column (usually the primary key) on each INSERT without specifying a value. MySQL tracks the next value to use. Gaps can occur (from failed inserts, rollbacks). The counter never decreases. Use BIGINT AUTO_INCREMENT for tables that will grow large to avoid integer overflow at 2 billion rows.
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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