This FC0-U61 practice question tests your understanding of database fundamentals. 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.
Refer to the exhibit. A user attempts to insert a row into Orders with a CustomerID that does not exist in the Customers table. What is the expected outcome?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The INSERT statement fails with a constraint violation
The INSERT statement fails with a constraint violation because the CustomerID column in the Orders table is defined as a foreign key referencing the CustomerID primary key in the Customers table. When a user attempts to insert a row with a CustomerID that does not exist in the Customers table, the relational database management system (RDBMS) enforces referential integrity and rejects the operation, raising a foreign key constraint violation error.
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 row is inserted but with a warning
Why it's wrong here
The insert fails entirely.
✗
The row is inserted successfully
Why it's wrong here
Violates foreign key constraint.
✗
The Customers table automatically creates a new customer
Why it's wrong here
No cascading inserts by default.
✓
The INSERT statement fails with a constraint violation
Why this is correct
Foreign key constraint error.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the database will silently accept the row or create a placeholder customer, failing to recognize that foreign key constraints enforce strict referential integrity and cause the statement to fail with an error.
Detailed technical explanation
How to think about this question
Under the hood, the RDBMS checks the foreign key constraint at the statement level (or row level depending on isolation) by verifying that the CustomerID value exists in the parent table's primary key or unique index. In a real-world e-commerce system, this prevents orphaned order records that would break data integrity, such as an order referencing a deleted customer. Some databases allow deferred constraint checking (e.g., SET CONSTRAINTS DEFERRED in PostgreSQL), but by default the violation is immediate.
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 FC0-U61 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.
Database Fundamentals — This question tests Database Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The INSERT statement fails with a constraint violation — The INSERT statement fails with a constraint violation because the CustomerID column in the Orders table is defined as a foreign key referencing the CustomerID primary key in the Customers table. When a user attempts to insert a row with a CustomerID that does not exist in the Customers table, the relational database management system (RDBMS) enforces referential integrity and rejects the operation, raising a foreign key constraint violation error.
What should I do if I get this FC0-U61 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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Question Discussion
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