Answer
A sequence is an independent object that generates incremental numeric values, commonly used for primary keys.
Quick Answer
A sequence is an independent database object that generates unique integer values in order. Used to auto-increment primary keys. CREATE SEQUENCE seq_name. Get next value: nextval("seq_name"). Current value: currval(). SERIAL/IDENTITY columns use sequences internally. Sequences are not transaction-aware - a rolled-back transaction still advances the sequence, creating gaps (this is expected and fine).
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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