A parent-to-child relationship query retrieves related child records within a parent query. The relationship name must come from the actual schema, not an assumed object plural.
Before you begin
Use an authorized development or training organization with fictional records. Record the object names, permissions and configuration used so that someone else can reproduce the exercise.
Work through the idea
First describe the business requirement and the records involved. Keep the exercise separate from a live organization's data and change process. Platform behavior can depend on permissions and configuration; verify those conditions rather than assuming an administrator's result applies to every user.
- Inspect the child relationship name
- Select only needed fields
- Consider parents with no children
Practice task
Query fictional Accounts and their Contacts in a training org, then count Contacts per returned Account.
Check your result
Handle zero, one and several children without assuming every parent has a populated child list.
A mistake to avoid
Do not confuse the child relationship name with a field's display label.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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