Quiz: Data Modeling
Five scenario questions with explanations and a visual checkpoint.
Visual checkpoint
Use this diagram to locate the state and failure boundaries tested by the questions. Answer all five questions before revealing feedback; the result is a study checkpoint rather than a certification.
Figure — Notice → Delivery (1 to many); Delivery → Attempt (1 to many); Recipient → Delivery (recipient); Recipient → Preference (live consent); Delivery → Dashboard view (derived counts)
Review your reasoning
After checking answers, identify the incorrect assumption behind each missed question. Rewrite it as a rule with a concrete exception or failure case, then return to the lesson.
A delivery worker sees no prior attempt and inserts a new one. Two workers do this at once. Where should uniqueness be enforced?
A delivery worker sees no prior attempt and inserts a new one. Two workers do this at once. Where should uniqueness be enforced?
Your design draft
Clarify assumptions, explain your approach, and test the difficult cases. Save your draft, then compare it with the study notes.
Self-review checklist
Self-guided practice. Automated AI feedback and code execution are not connected.