- A
Use a script in the 'On Before' transform to check for existing records.
Why wrong: While possible, this is not the standard or recommended approach; coalesce is simpler and more efficient.
- B
Set the 'Reject duplicates' checkbox on the transform map.
Why wrong: ServiceNow transform maps do not have a 'Reject duplicates' option; this is a distractor.
- C
Set the 'Coalesce' field to true on the field mapping for u_employee_id.
Coalescing on a unique identifier prevents duplicate key imports by matching existing records.
- D
Configure a business rule on the target table to reject duplicates.
Why wrong: Business rules operate after the record is created, so they cannot prevent the initial insert; they could roll back but it's inefficient and not intended for this purpose.
Import Deduplication Using Coalesce — ServiceNow CSA
This SNOW-CSA practice question tests your understanding of reporting, sla and imports. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During an import, the source data contains duplicate records that should be ignored (not imported). The target table has a unique key field u_employee_id. Which configuration in the transform map will prevent these duplicates from creating new records?
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
Set the 'Coalesce' field to true on the field mapping for u_employee_id.
Option C is correct because setting the 'Coalesce' field to true on the field mapping for u_employee_id tells the transform map to use that field as the key for deduplication. When coalesce is enabled, the import engine checks if a record with the same value in that field already exists in the target table; if it does, the incoming record is skipped (not imported). This directly prevents duplicate records from being created without requiring custom scripting or additional configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 script in the 'On Before' transform to check for existing records.
Why it's wrong here
While possible, this is not the standard or recommended approach; coalesce is simpler and more efficient.
- ✗
Set the 'Reject duplicates' checkbox on the transform map.
Why it's wrong here
ServiceNow transform maps do not have a 'Reject duplicates' option; this is a distractor.
- ✓
Set the 'Coalesce' field to true on the field mapping for u_employee_id.
Why this is correct
Coalescing on a unique identifier prevents duplicate key imports by matching existing records.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a business rule on the target table to reject duplicates.
Why it's wrong here
Business rules operate after the record is created, so they cannot prevent the initial insert; they could roll back but it's inefficient and not intended for this purpose.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the distinction between 'coalesce' (which prevents duplicate inserts by checking for existing records) and the non-existent 'Reject duplicates' checkbox, leading candidates to select a plausible-sounding but incorrect option.
Detailed technical explanation
How to think about this question
The coalesce field mapping property works by performing a lookup on the target table using the specified field (e.g., u_employee_id) before the insert operation. If a match is found, the transform engine sets the 'action' to 'ignore' for that row, meaning no insert, update, or error occurs. This is particularly useful in incremental imports where the source system may resend the same records, ensuring idempotent imports without manual intervention.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Reporting, SLA and Imports — study guide chapter
Learn the concepts, then practise the questions
- →
Reporting, SLA and Imports practice questions
Targeted practice on this topic area only
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ServiceNow Certified System Administrator CSA study guide
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SNOW-CSA practice test guide
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FAQ
Questions learners often ask
What does this SNOW-CSA question test?
Reporting, SLA and Imports — This question tests Reporting, SLA and Imports — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the 'Coalesce' field to true on the field mapping for u_employee_id. — Option C is correct because setting the 'Coalesce' field to true on the field mapping for u_employee_id tells the transform map to use that field as the key for deduplication. When coalesce is enabled, the import engine checks if a record with the same value in that field already exists in the target table; if it does, the incoming record is skipped (not imported). This directly prevents duplicate records from being created without requiring custom scripting or additional configuration.
What should I do if I get this SNOW-CSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This SNOW-CSA practice question is part of Courseiva's free ServiceNow certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SNOW-CSA exam.
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