This DP-203 practice question tests your understanding of develop data processing. 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
Refer to the exhibit.
-- KQL query in Azure Data Explorer
let startTime = datetime(2024-01-01);
let endTime = datetime(2024-01-02);
T
| where Timestamp between (startTime .. endTime)
| summarize count() by bin(Timestamp, 1h)
| render timechart
Refer to the exhibit. You are running the KQL query in Azure Data Explorer. The query returns no results, but you know there is data in the table T. What is the most likely issue?
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.
Refer to the exhibit.
-- KQL query in Azure Data Explorer
let startTime = datetime(2024-01-01);
let endTime = datetime(2024-01-02);
T
| where Timestamp between (startTime .. endTime)
| summarize count() by bin(Timestamp, 1h)
| render timechart
A
The bin function is used incorrectly; should be bin(Timestamp, 1h) but placed in the wrong clause
Why wrong: bin is correctly used in summarize.
B
The between operator syntax is incorrect; should be 'between (startTime..endTime)' without spaces around the dots
Spaces around the '..' can cause the range to be misparsed.
C
The datetime format is incorrect; use ISO 8601
Why wrong: The datetime literals are correct.
D
The table T does not exist in the database
Why wrong: If table didn't exist, there would be an error, not empty results.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The between operator syntax is incorrect; should be 'between (startTime..endTime)' without spaces around the dots
Option B is correct because the KQL `between` operator requires the range syntax `between(datetime1..datetime2)` with no spaces around the two dots. The query uses `between (startTime .. endTime)` with spaces, which is invalid syntax and causes the query to return no results even though data exists in table T.
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 bin function is used incorrectly; should be bin(Timestamp, 1h) but placed in the wrong clause
Why it's wrong here
bin is correctly used in summarize.
✓
The between operator syntax is incorrect; should be 'between (startTime..endTime)' without spaces around the dots
Why this is correct
Spaces around the '..' can cause the range to be misparsed.
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 datetime format is incorrect; use ISO 8601
Why it's wrong here
The datetime literals are correct.
✗
The table T does not exist in the database
Why it's wrong here
If table didn't exist, there would be an error, not empty results.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the exact syntax of KQL operators like `between`, where candidates overlook the requirement for no spaces around the two dots, assuming whitespace is allowed as in other languages.
Detailed technical explanation
How to think about this question
In Kusto Query Language (KQL), the `between` operator is a range operator that must follow the exact syntax `between(expression1..expression2)` without whitespace around the two dots. The dots represent the range separator, and any spaces break the parsing, causing the operator to be ignored or misinterpreted. This is a common syntax pitfall in Azure Data Explorer queries, especially when copying from documentation or examples that may inadvertently include spaces.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Develop data processing — This question tests Develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The between operator syntax is incorrect; should be 'between (startTime..endTime)' without spaces around the dots — Option B is correct because the KQL `between` operator requires the range syntax `between(datetime1..datetime2)` with no spaces around the two dots. The query uses `between (startTime .. endTime)` with spaces, which is invalid syntax and causes the query to return no results even though data exists in table T.
What should I do if I get this DP-203 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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