Microsoft Power BI Data Analyst PL-300 Practice Test 18
Question 170
A report needs to count unique customers making purchases even if a customer places multiple orders. Which Power BI or Power Query action BEST meets the stated requirement?
- Use COUNTROWS(ALL(Sales))
- Use COUNTROWS(Sales) as the customer count
- Use SUM(Sales[CustomerID])
- Use DISTINCTCOUNT(Sales[CustomerID]) in the active filter context
Explanation
Correct Answer
D:Distinct customer counting prevents repeat orders from inflating the customer total This addresses the specific requirement: a report needs to count unique customers making purchases even if a customer places multiple orders.
Incorrect Answers
A:Removing filters produces an unfiltered transaction count, not distinct customers This alternative therefore fails an explicit scenario constraint.
B:A row per transaction can count one customer multiple times This alternative therefore fails an explicit scenario constraint.
C:An identifier should not be summed to represent the number of customers This alternative therefore fails an explicit scenario constraint.
Question 171
A report already filters a set of allowed product colors and the new measure must further require Red without reintroducing Red if it was previously excluded. A pilot instead implemented the following proposed change: Use a normal replacement CALCULATE color filter without KEEPFILTERS. The business requirement was not met. Which technical limitation MOST DIRECTLY explains the result?
- KEEPFILTERS intersects the new filter with existing Color selections instead of overwriting them
- A title does not affect DAX filter intersection semantics
- A normal filter on the same column may replace the existing color selection
- Removing Color filters erases the original user restriction entirely
Explanation
Correct Answer
C:A normal filter on the same column may replace the existing color selection This specifically addresses the deployed or proposed alternative: Use a normal replacement CALCULATE color filter without KEEPFILTERS.
Incorrect Answers
A:KEEPFILTERS intersects the new filter with existing Color selections instead of overwriting them This supports the recommended design but does not diagnose why the specified alternative fails.
B:A title does not affect DAX filter intersection semantics That limitation describes Change only the report title to indicate Red, not the specified approach.
D:Removing Color filters erases the original user restriction entirely That limitation applies to a different alternative (Use REMOVEFILTERS(Product[Color])), not the one here.
Question 172
A product manager wants the same quarter last year compared with the selected quarter this year using a contiguous marked date table. After the correct solution is implemented, which result provides the MOST DIRECT evidence that the requirement actually works?
- The field uses the expected numeric format, but no zero-denominator or date-boundary case was tested
- Selecting a quarter returns that same quarter's revenue from the prior calendar year
- The measure changes after a slicer click, but the result has not been compared against known test rows
- The DAX expression parses and returns a number for one unfiltered report page
Explanation
Correct Answer
B:Selecting a quarter returns that same quarter's revenue from the prior calendar year This exercises the requested business outcome and the necessary positive or negative boundary.
Incorrect Answers
A:Formatting and a normal case do not validate the edge condition the calculation is supposed to handle.
C:Reacting to a slicer does not establish the correct math or intended filter semantics.
D:A valid DAX expression may still evaluate the wrong period, denominator or context under filters.
Question 173
A Power BI report takes nine seconds to render and the team must find whether a specific visual or DAX query dominates the delay. After the correct solution is implemented, which result provides the MOST DIRECT evidence that the requirement actually works?
- The identified slow visual has measured render times before and after a targeted change
- The edited query saves, but the expected folding or model-size effect has not been measured
- One visual renders faster, but the result totals have not been compared for correctness
- A developer reports the model feels faster, but no before-and-after query trace was collected
Explanation
Correct Answer
A:The identified slow visual has measured render times before and after a targeted change This exercises the requested business outcome and the necessary positive or negative boundary.
Incorrect Answers
B:Saving changes does not prove predicate pushdown or storage reduction occurred.
C:An invalidly simplified calculation can be fast while returning wrong results.
D:Perceived speed without measurements cannot establish the claimed optimization.
Question 174
A large DirectQuery Sales source repeatedly computes the same weekly totals and reports need low-latency common aggregates. After the correct solution is implemented, which result provides the MOST DIRECT evidence that the requirement actually works?
- A developer reports the model feels faster, but no before-and-after query trace was collected
- The edited query saves, but the expected folding or model-size effect has not been measured
- One visual renders faster, but the result totals have not been compared for correctness
- Common week-level queries hit the aggregation path while detail drill-down can still use underlying fact data
Explanation
Correct Answer
D:Common week-level queries hit the aggregation path while detail drill-down can still use underlying fact data This exercises the requested business outcome and the necessary positive or negative boundary.
Incorrect Answers
A:Perceived speed without measurements cannot establish the claimed optimization.
B:Saving changes does not prove predicate pushdown or storage reduction occurred.
C:An invalidly simplified calculation can be fast while returning wrong results.
Question 175
Sales has OrderDate and ShipDate columns but business users need two independent date slicers, one for order month and one for ship month. Which Power BI or Power Query action BEST meets the stated requirement?
- Use separate role-playing Order Date and Ship Date dimensions with active relationships
- Use a Product dimension with duplicated calendar dates
- Use one active date relationship and expect it to filter both date columns
- Use one Date dimension linked actively to both fact date columns
Explanation
Correct Answer
A:Independent date roles let two slicers filter their corresponding fact dates simultaneously This addresses the specific requirement: sales has OrderDate and ShipDate columns but business users need two independent date slicers, one for order month and one for ship month.
Incorrect Answers
B:Product membership does not supply separate order and shipment calendar roles This alternative therefore fails an explicit scenario constraint.
C:One active relationship follows one date role, not the independent second role This alternative therefore fails an explicit scenario constraint.
D:Multiple active ambiguous paths between the same tables cannot normally be created This alternative therefore fails an explicit scenario constraint.
Question 176
Sales has OrderDate and ShipDate columns but business users need two independent date slicers, one for order month and one for ship month. A design reviewer proposes this alternative: Use one active date relationship and expect it to filter both date columns. Which objection BEST explains why it would not satisfy the stated requirement?
- One active relationship follows one date role, not the independent second role
- Multiple active ambiguous paths between the same tables cannot normally be created
- Product membership does not supply separate order and shipment calendar roles
- Independent date roles let two slicers filter their corresponding fact dates simultaneously
Explanation
Correct Answer
A:One active relationship follows one date role, not the independent second role This specifically addresses the deployed or proposed alternative: Use one active date relationship and expect it to filter both date columns.
Incorrect Answers
B:Multiple active ambiguous paths between the same tables cannot normally be created That limitation applies to a different alternative (Use one Date dimension linked actively to both fact date columns), not the one here.
C:Product membership does not supply separate order and shipment calendar roles That limitation describes Use a Product dimension with duplicated calendar dates, not the specified approach.
D:Independent date roles let two slicers filter their corresponding fact dates simultaneously This supports the recommended design but does not diagnose why the specified alternative fails.
Question 177
An executive time intelligence report needs consistent full-year month comparisons across multiple fact tables, including months with no transactions. After the correct solution is implemented, which result provides the MOST DIRECT evidence that the requirement actually works?
- One aggregate value is nonblank, but filtering has not been tested from each intended dimension
- The model saves successfully, but source keys and report totals have not been reconciled
- The calendar includes every required date and month and time intelligence measures evaluate across missing-sales periods
- The relationship diagram displays a line between tables, but no matching-key uniqueness test has run
Explanation
Correct Answer
C:The calendar includes every required date and month and time intelligence measures evaluate across missing-sales periods This exercises the requested business outcome and the necessary positive or negative boundary.
Incorrect Answers
A:An unfiltered total cannot establish that the model's date roles and cross-filter paths behave as specified.
B:Saving a model does not rule out duplicate dimension rows, ambiguous paths or fact multiplication.
D:A visible relationship is not proof that the dimension key and relationship cardinality are valid.
Question 178
A report already filters a set of allowed product colors and the new measure must further require Red without reintroducing Red if it was previously excluded. After the correct solution is implemented, which result provides the MOST DIRECT evidence that the requirement actually works?
- When the slicer excludes Red the measure remains blank and when it includes Red the measure returns Red-only revenue
- The measure changes after a slicer click, but the result has not been compared against known test rows
- The DAX expression parses and returns a number for one unfiltered report page
- The field uses the expected numeric format, but no zero-denominator or date-boundary case was tested
Explanation
Correct Answer
A:When the slicer excludes Red the measure remains blank and when it includes Red the measure returns Red-only revenue This exercises the requested business outcome and the necessary positive or negative boundary.
Incorrect Answers
B:Reacting to a slicer does not establish the correct math or intended filter semantics.
C:A valid DAX expression may still evaluate the wrong period, denominator or context under filters.
D:Formatting and a normal case do not validate the edge condition the calculation is supposed to handle.
Question 179
A measure must calculate revenue only for Internet sales while respecting an existing year slicer. Which Power BI or Power Query action BEST meets the stated requirement?
- Use COUNTROWS(VALUES(Sales[Channel])) instead of revenue
- Use ALL(Sales) to remove every model filter
- Use FORMAT([Total Revenue], "Currency") to filter Channel
- Use CALCULATE([Total Revenue], Sales[Channel] = "Internet")
Explanation
Correct Answer
D:CALCULATE modifies the Channel filter while other compatible filters such as Year continue to apply This addresses the specific requirement: a measure must calculate revenue only for Internet sales while respecting an existing year slicer.
Incorrect Answers
A:Counting distinct channels is not a channel-specific revenue sum This alternative therefore fails an explicit scenario constraint.
B:Removing all filters would lose the requested year selection This alternative therefore fails an explicit scenario constraint.
C:FORMAT changes presentation and returns text but does not filter sales rows This alternative therefore fails an explicit scenario constraint.
Question 180
A financial report needs dynamic Margin Percent that changes when users slice by company and quarter. A pilot instead implemented the following proposed change: Create a static calculated column for company-wide margin percent. The business requirement was not met. Which technical limitation MOST DIRECTLY explains the result?
- Formatting an amount cannot compute margin divided by revenue
- A measure recalculates under slicers, unlike a stored row value
- A stored calculated column will not recompute a company-wide ratio for changing slicer selections
- A query parameter is not a filter-context-aware report calculation
Explanation
Correct Answer
C:A stored calculated column will not recompute a company-wide ratio for changing slicer selections This specifically addresses the deployed or proposed alternative: Create a static calculated column for company-wide margin percent.
Incorrect Answers
A:Formatting an amount cannot compute margin divided by revenue That limitation describes Format the SalesAmount column as Percentage, not the specified approach.
B:A measure recalculates under slicers, unlike a stored row value This supports the recommended design but does not diagnose why the specified alternative fails.
D:A query parameter is not a filter-context-aware report calculation That limitation applies to a different alternative (Create a Power Query scalar parameter for the quarterly ratio), not the one here.