SALESFORCE-PD1 Developer Fundamentals Practice Question
An Apex trigger processes a list of Case records. The developer wants to group the cases by their AccountId. Which data structure is best suited for this grouping?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Map<Id, List<Case>>
A Map where the key is the AccountId (Id) and the value is a List of Cases (List<Case>) allows efficient grouping of child records by parent ID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
List<Map<Id, Case>>
Why it's wrong here
A list of maps does not provide direct key-based lookup for grouping.
- ✗
Set<Map<Id, Case>>
Why it's wrong here
Maps cannot be elements of a Set because they are not hashable primitives.
- ✗
Map<Id, Case>
Why it's wrong here
Map<Id, Case> only allows one Case per AccountId, which fails if multiple cases share an account.
- ✓
Map<Id, List<Case>>
Why this is correct
This structure supports multiple cases per AccountId.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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