MySQL + SQL · Lesson 92

Query Optimization in MySQL

Why Optimize?

As data grows, slow queries hurt. Optimization makes queries run faster using indexes and better SQL.

Key Tips

  • Add indexes on columns used in WHERE and JOIN.
  • Select only needed columns, not SELECT *.
  • Avoid functions on indexed columns in WHERE (e.g. WHERE YEAR(d)=2026 skips the index).
  • Use EXPLAIN to see how a query runs.
  • Filter early with WHERE before joining.

Summary

  • Optimize with indexes, fewer columns, and index-friendly WHERE.
  • Use EXPLAIN to find slow spots.
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