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Nov 1, 2022 · Databases

Understanding How Indexes Influence MySQL JOIN Queries and the Mechanics of Index and Block Nested-Loop Joins

This article explains how MySQL uses indexes during JOIN operations, compares indexed and non‑indexed join execution, introduces Index Nested‑Loop Join and Block Nested‑Loop Join algorithms, discusses the role of the join buffer, and provides practical guidance on choosing the optimal driving table for efficient query performance.