✅ Yes! You just got the 15-Minute Slow Query Diagnostic. Now you know what kind of problem is slowing your query down.
But knowing the problem type and understanding why it's happening are two different things.
To go deeper, you need to read the query plan, which is the database's step-by-step breakdown of how it's actually executing your query.
That's what Query Plan Decoded is for.
One more thing before you go...
Read any query plan in 30 minutes, even if you've never opened one before
What's Inside:
8 walkthrough videos. Two for each database.
We use the same queries in every database (a slow query with no indexes, and a query with indexes) and we walk through the execution plan, understanding each step in the plan, and why it's done.
MySQL: Reading EXPLAIN Output
Run EXPLAIN and EXPLAIN ANALYZE, and read a real plan from a slow query. Understand the steps, cost, timing, and other details.
PostgreSQL: Reading EXPLAIN ANALYZE
The output is tree-shaped instead of a table, and it runs the query to show you actual times alongside estimates. We'll walk through it node by node: what Seq Scan means, why the gap between estimated and actual rows matters, and how to confirm your fix worked.
SQL Server: Reading the Graphical Execution Plan
SQL Server shows you the plan visually in SSMS. You read it right-to-left, watch the arrow widths to spot expensive operations, and look for different node types, understanding what they do.
Oracle: Using EXPLAIN PLAN and DBMS_XPLAN
Generate an execution plan using Oracle's approach, and understand what each step is doing and what each column represents. We'll also cover the Predicate Information section and what it means.
8 videos. About 30 minutes for each vendor. Each vendor stands alone, so watch only the videos for your database vendor if that's all you need
Normal Price: $97
Your price today, as a customer:
$37
This offer is only available right now. It won't appear again.
"A good investment"
"Your Write Faster SQL course is a good investment. The approach is interesting in that you are showing the same lessons against 4 different database engines. That helps developers understand the bigger picture rather than just ‘how to’ for their most common/only database"
- Doug T, course student
"Reduced our cloud costs"
"After the Database Star training, I did identify all the worst running queries on my production databases and fixed them and that reduced our cloud costs."
- David B, course student
"Best training material on SQL anywhere"
"It’s the best training material on SQL anywhere. You have a rare gift for making the complex simple. Thank you for all you do!"
- Brad C, course student
What This Is Not
This isn't a deep dive into query optimiser internals. It won't cover every edge case or advanced feature.
It's 30 minutes of practical, working knowledge. Enough to open a query plan, understand what you're looking at, and know exactly what to change.
That's what most developers actually need.
30-Day Money Back Guarantee
If you go through Query Plan Decoded and aren't satisfied, let me know within 30 days, and I'll give you a full refund.
Normal Price: $97
Your price today, as a customer:
$37
This offer is only available right now. It won't appear again.
