Quick Answer
The correct answers are fillnull and coalesce. The fillnull command directly replaces null field values with a specified default string, or with '0' if no default is provided, making it the most straightforward tool for this task. The coalesce function, used within an eval command, returns the first non-null value from a list of fields or expressions, effectively substituting a fallback default when a field is missing. On the Splunk SPLK-1002 exam, this question tests your understanding of how to clean incomplete data in search results, often appearing as a multiple-select item where you must distinguish between commands that handle nulls versus those that simply filter them out. A common trap is confusing coalesce with the fillnull command’s syntax—remember that fillnull works on entire fields in a search pipeline, while coalesce works on individual field values within an eval expression. Memory tip: think of fillnull as “filling the nulls” across all fields, and coalesce as “coalescing” multiple options into one non-null result.
This SPLK-1002 practice question tests your understanding of using fields and lookups. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A Splunk admin wants to handle missing field values in a search. Which TWO commands can replace null values with a specified default? (Choose two.)
coalesce
coalesce returns the first non-null value.
eval
Why wrong: eval alone does not replace nulls.
convert
Why wrong: convert is for data type conversion.
fillnull
fillnull replaces nulls with a specified value.
default
Why wrong: No such command.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
coalesce
The `fillnull` command explicitly replaces null field values with a specified default string (or '0' if no default is given). The `coalesce` function, used within an `eval` command, returns the first non-null value from a list of fields or expressions, effectively replacing nulls with a fallback default. Both commands directly address missing field values by substituting a specified default.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
coalesce
Why this is correct
coalesce returns the first non-null value.
Related concept
Read the scenario before looking for a memorised answer.
eval
Why it's wrong here
eval alone does not replace nulls.
convert
Why it's wrong here
convert is for data type conversion.
fillnull
Why this is correct
fillnull replaces nulls with a specified value.
Related concept
Read the scenario before looking for a memorised answer.
default
Why it's wrong here
No such command.
Common exam traps
Splunk often tests the distinction between commands that modify data (like `fillnull`) and functions that operate within `eval` (like `coalesce`), and the trap here is that candidates may incorrectly select `eval` alone or the non-existent `default` command, thinking they handle nulls without needing a specific function.
Trap categories for this question
Command / output trap
No such command.
Detailed technical explanation
The `fillnull` command operates on the entire search result set, scanning all fields (or specified fields) and replacing nulls with a default value (defaulting to '0' if not specified). The `coalesce` function is part of the `eval` command and evaluates arguments in order, returning the first non-null value; it is often used in calculated fields to provide fallback values. In real-world scenarios, `fillnull` is useful for ensuring consistent data in statistical aggregations, while `coalesce` is ideal for conditional field assignments in `eval` expressions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the SPLK-1002 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
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Using Fields and Lookups — study guide chapter
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FAQ
Using Fields and Lookups — This question tests Using Fields and Lookups — Read the scenario before looking for a memorised answer..
The correct answer is: coalesce — The `fillnull` command explicitly replaces null field values with a specified default string (or '0' if no default is given). The `coalesce` function, used within an `eval` command, returns the first non-null value from a list of fields or expressions, effectively replacing nulls with a fallback default. Both commands directly address missing field values by substituting a specified default.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This SPLK-1002 practice question is part of Courseiva's free Splunk 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 SPLK-1002 exam.
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