Tools

SQL Query Cost Estimator for Quick Reviews

Get a quick complexity summary of SQL queries without running EXPLAIN.

SQL Query Cost Estimator

Review SQL queries and get a quick complexity summary before deeper analysis. This helps teams prioritize which queries need optimization or review.

How to use the SQL Query Cost Estimator

  1. Paste your SQL query.
  2. Click Estimate.
  3. Review the summary metrics.

Common use cases

  • Spot-checking queries during code review.
  • Identifying expensive joins or scans.
  • Triaging performance issues from logs.
  • Comparing alternative query approaches.

Tips & notes

  • Use database EXPLAIN for accurate plans.
  • Join count alone does not imply slow queries.
  • Consider indexes and data volume together.

Related developer tools

  • SQL Index Usage Analyzer
  • SQL Minifier
  • JSON Formatter

FAQ

Is this an actual EXPLAIN?
No, it is a heuristic summary.
Does it detect missing indexes?
It can hint at potential issues but does not verify indexes.
Can I use it for production estimates?
Use it for quick review, not as a final performance guarantee.