The answer is to set the relationship between Sales and Customer to 'Enforce Referential Integrity'. This is correct because this setting, found in the Power BI relationship view, ensures that every value in the foreign key column (CustomerKey in the Sales fact table) has a matching primary key value in the related dimension table (Customer), automatically filtering out any orphaned rows during data load and query execution. On the Microsoft Power BI Data Analyst PL-300 exam, this concept tests your understanding of data modeling best practices, specifically how to maintain data quality without altering the underlying table structure—a common trap is confusing this with merging tables or hiding columns, which do not enforce integrity. Remember the memory tip: "Enforce it at the relationship, not the row"—the integrity check happens at the model's join, not by manipulating the data itself.
PL-300 Model the data Practice Question
This PL-300 practice question tests your understanding of model the data. 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.
You have a Power BI model with a fact table 'Sales' and dimensions 'Customer', 'Product', 'Date'. You need to enforce that every fact row has a valid CustomerKey. Which approach enforces referential integrity in Power BI?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the relationship between Sales and Customer to 'Enforce Referential Integrity'
Option C is correct because marking the relationship as 'Enforce Referential Integrity' in Power BI ensures that only valid keys are used. Option A is wrong because combining tables changes the model structure. Option B is wrong because hiding columns does not enforce integrity. Option D is wrong because the assumption is not enforced natively.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Merge Sales and Customer tables into a single table
Why it's wrong here
Merging tables changes the schema and does not enforce integrity.
✗
Hide CustomerKey columns in both tables
Why it's wrong here
Hiding columns does not enforce referential integrity.
✗
Assume all CustomerKey values are valid
Why it's wrong here
Assumption does not enforce integrity.
✓
Set the relationship between Sales and Customer to 'Enforce Referential Integrity'
Why this is correct
This setting validates that every Sales.CustomerKey exists in Customer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
Model the data — This question tests Model the data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the relationship between Sales and Customer to 'Enforce Referential Integrity' — Option C is correct because marking the relationship as 'Enforce Referential Integrity' in Power BI ensures that only valid keys are used. Option A is wrong because combining tables changes the model structure. Option B is wrong because hiding columns does not enforce integrity. Option D is wrong because the assumption is not enforced natively.
What should I do if I get this PL-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PL-300 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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