SNOW-CAD Practice Question: Automating application logic with business rules and scripts
A developer wants to trigger a Business Rule on a child table when a parent record is updated. How can this be achieved?
⚠ Common exam trap
Candidates often assume a Business Rule can only be triggered directly on the table being updated, overlooking the ability to use conditions on related table records to react to parent changes.
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
✓
Add a condition on the child table's Business Rule referencing the parent.
A Business Rule on the child table can include a condition that checks whether a related parent record has been updated. This is done by referencing the parent table's fields via dot-walking (e.g., `current.parent_field.changes()`) or by querying the parent record's sys_updated_on field. The Business Rule runs on the child table when a child record is inserted or updated, and the condition evaluates the parent's state, allowing the rule to trigger logic based on parent changes without requiring a direct trigger on the parent table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a workaround with a scheduled job.
Why it's wrong here
Scheduled jobs are not triggered by updates.
- ✓
Add a condition on the child table's Business Rule referencing the parent.
Why this is correct
Condition can check parent field changes.
- ✗
This is not possible in ServiceNow.
Why it's wrong here
It is possible using conditions.
- ✗
Use a before query Business Rule on the child table.
Why it's wrong here
Before query runs on query, not update.
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Senior Network & Security Engineer · founder of Courseiva
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