Lesson 1: A customer stored twice · 7 min
Before you begin · The duplicate · What went wrong
Learners prepare on their own, you answer questions live, and the surveys tell you what stuck. 8 fields to fill in with your own policy, contacts and locations; each one is highlighted inside the course.



What learners can do at the end of each lesson. Minutes are an estimate.
Before you begin · The duplicate · What went wrong
Keys · Spot the anomaly · Check
ACID in plain words · The half-done transfer · Constraints
Pattern · Review the snippet · Check
What an index does · Index or not? · Raise it early
The reviewer's checklist · Practice