Quick Answer
The correct choice is that the SQL filter is case-sensitive, so 'EU' does not match 'eu'. Azure Service Bus SQL filters evaluate string comparisons exactly as written, meaning that uppercase and lowercase letters are treated as distinct values—'EU' and 'eu' are not equivalent. This is a critical distinction for the AZ-204 exam, which often tests your understanding of how filter rules apply to message routing in topics and subscriptions. A common trap is assuming that SQL filters behave like SQL in databases, where collation settings might ignore case; in Service Bus, no such default exists, so you must ensure property values match the filter exactly. To remember this, think of the mnemonic “SQL in Service Bus is Strictly Case-Sensitive,” or simply note that if your filter says ‘EU,’ your message must say ‘EU’—no exceptions.
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Your company uses Azure Service Bus topics and subscriptions to send order notifications. You notice that some messages are not being delivered to a subscription. The subscription has a SQL filter that matches messages with a 'region' property equal to 'EU'. You verify that the messages have 'region' set to 'eu' (lowercase). 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.
The SQL filter is case-sensitive and 'EU' does not match 'eu'.
SQL filters are case-sensitive by default.
The subscription is disabled.
Why wrong: Disabled subscription would not receive any messages.
The subscription has no filter defined.
Why wrong: If no filter, all messages would be delivered.
The subscription has a correlation filter instead.
Why wrong: Correlation filters are not case-sensitive but the problem states SQL filter.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The SQL filter is case-sensitive and 'EU' does not match 'eu'.
Option B is correct because SQL filters in Service Bus are case-sensitive. Option A is wrong because the Action property does not affect filtering. Option C is wrong because the default filter is 'MatchAll', which would match all messages. Option D is wrong because the subscription already exists.
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.
The SQL filter is case-sensitive and 'EU' does not match 'eu'.
Why this is correct
SQL filters are case-sensitive by default.
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 subscription is disabled.
Why it's wrong here
Disabled subscription would not receive any messages.
The subscription has no filter defined.
Why it's wrong here
If no filter, all messages would be delivered.
The subscription has a correlation filter instead.
Why it's wrong here
Correlation filters are not case-sensitive but the problem states SQL filter.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
The correct answer is: The SQL filter is case-sensitive and 'EU' does not match 'eu'. — Option B is correct because SQL filters in Service Bus are case-sensitive. Option A is wrong because the Action property does not affect filtering. Option C is wrong because the default filter is 'MatchAll', which would match all messages. Option D is wrong because the subscription already exists.
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft 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 AZ-204 exam.
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