The answer is that the 'amount' field is not numeric in the invoice table. This is the most likely cause because GlideAggregate’s sum method requires a numeric field type to perform aggregation; when you call addAggregate('SUM', 'amount') on a non-numeric field—such as a string or currency stored as text—the engine returns zero since it cannot mathematically sum non-numeric data. On the ServiceNow Certified Application Developer exam, this scenario tests your understanding of GlideAggregate’s behavior with field types, often appearing as a trap where candidates assume any field named “amount” is automatically numeric. A common memory tip is to always verify the field’s dictionary type before aggregating: if it’s not integer, float, or currency, GlideAggregate sum will silently return zero. Remember the rule: “Check the type before you sum the stripe.”
SNOW-CAD Practice Question: Automating application logic with business rules and scripts
This SNOW-CAD practice question tests your understanding of automating application logic with business rules and scripts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
var MyUtils = Class.create();
MyUtils.prototype = {
initialize: function() {},
getTotal: function(table, query) {
var ga = new GlideAggregate(table);
ga.addQuery(query);
ga.addAggregate('SUM', 'amount');
ga.query();
if (ga.next()) {
return ga.getAggregate('SUM', 'amount');
}
return 0;
},
type: 'MyUtils'
};
Refer to the exhibit. A Business Rule in the same scope calls this script include using 'var total = new MyUtils().getTotal("invoice", "state=paid");' but gets '0' even though there are records. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'amount' field is not numeric in the invoice table.
The Business Rule calls `getTotal` which uses `GlideAggregate` to sum the `amount` field. If the `amount` field is not numeric (e.g., it is a string or another non-numeric type), `GlideAggregate.addAggregate('SUM', 'amount')` will return `0` because it cannot perform a numeric aggregation on non-numeric data. This matches option B.
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.
✗
The getTotal method is not properly defined.
Why it's wrong here
Method is correctly defined.
✓
The 'amount' field is not numeric in the invoice table.
Why this is correct
Non-numeric field causes SUM to return null.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The GlideAggregate query syntax is incorrect.
Why it's wrong here
Encoded query is valid.
✗
The script include is not accessible from the Business Rule's scope.
Why it's wrong here
Same scope, no access issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the misconception that a GlideAggregate query syntax error is the cause, when the real issue is a non-numeric field type that prevents aggregation from returning a valid sum.
Detailed technical explanation
How to think about this question
GlideAggregate performs SQL-like aggregation on database columns. If the column type is not numeric (e.g., string, boolean), the SUM aggregation will silently return 0 or NULL because the database cannot sum non-numeric values. In ServiceNow, field types like 'Integer', 'Float', or 'Currency' are numeric; 'String' or 'Choice' are not. Always verify the field's dictionary type when using aggregation.
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-CAD 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.
Automating application logic with business rules and scripts — This question tests Automating application logic with business rules and scripts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The 'amount' field is not numeric in the invoice table. — The Business Rule calls `getTotal` which uses `GlideAggregate` to sum the `amount` field. If the `amount` field is not numeric (e.g., it is a string or another non-numeric type), `GlideAggregate.addAggregate('SUM', 'amount')` will return `0` because it cannot perform a numeric aggregation on non-numeric data. This matches option B.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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