The answer is CROSSJOIN, which is the correct DAX function to show all combinations even with blank sales. CROSSJOIN creates a Cartesian product of the specified columns, generating every possible pair of year and category, and when you left join this result to the sales table, rows with no sales will appear with blank values instead of being omitted. On the Microsoft Power BI Data Analyst PL-300 exam, this question tests your understanding of handling incomplete data in DAX queries, often appearing in scenarios where you need to ensure a complete matrix of dimensions for reporting. A common trap is confusing CROSSJOIN with SUMMARIZECOLUMNS or NATURALINNERJOIN, which automatically filter out blank combinations; remember that CROSSJOIN is your go-to for forcing all combinations into the output. Memory tip: think “CROSSJOIN crosses every row with every row—no combination left behind.”
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.
Exhibit
Refer to the exhibit.
```
EVALUATE
SUMMARIZECOLUMNS(
'Date'[Year],
'Product'[Category],
"Total Sales", SUM(Sales[Amount])
)
```
Refer to the exhibit. You are using DAX Studio to profile a Power BI semantic model. The query above returns a table with sales totals by year and product category. However, you notice that the results do not include rows for years or categories with no sales. Which DAX function should you use to ensure all combinations of year and category appear, even with blank sales?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CROSSJOIN
Option D is correct because CROSSJOIN generates all combinations of the columns, then you can left join with the sales table. Option A is for cross-tabulation. Option B is an older function that may not handle blanks well. Option C is not a valid DAX function.
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.
✗
ADDCOLUMNS
Why it's wrong here
ADDCOLUMNS adds columns to an existing table but does not ensure all combinations.
✓
CROSSJOIN
Why this is correct
CROSSJOIN creates all combinations of the distinct values from the columns.
Related concept
Static NAT maps one inside address to one outside address.
✗
SUMMARIZE
Why it's wrong here
SUMMARIZE behaves similarly to SUMMARIZECOLUMNS and may also skip blanks.
✗
EXPAND
Why it's wrong here
There is no EXPAND function in DAX.
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.
Trap categories for this question
Similar concept trap
SUMMARIZE behaves similarly to SUMMARIZECOLUMNS and may also skip blanks.
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: CROSSJOIN — Option D is correct because CROSSJOIN generates all combinations of the columns, then you can left join with the sales table. Option A is for cross-tabulation. Option B is an older function that may not handle blanks well. Option C is not a valid DAX function.
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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