This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. SQL Query Optimization SQL Query Optimization SQL Query Optimization SQL Query Optimization SQL Query Optimization SQL Query Optimization SQL Query Optimization SQL Query Optimization Why Query Optimization Matters A poorly written query can take seconds or minutes instead of milliseconds, consuming database resources and degrading the experience for all users. Optimizing queries is often the highest-ROI performance improvement you can make because it requires no infrastructure changes. Understanding EXPLAIN Every database has a query planner that decides how to execute your SQL. EXPLAIN shows you the plan.…