Answer
Partial indexes apply only to rows satisfying a condition, reducing index size and improving efficiency.
Quick Answer
Partial index indexes only rows matching a WHERE condition, making it smaller and faster to maintain. Useful when: queries consistently filter on a specific value (WHERE status = "pending"), most of the table data is irrelevant to queries (soft-deleted rows), or you want a partial unique constraint (unique among non-deleted rows). The query must match the partial index WHERE to use it.
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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