Does Replacing > 0 with >= 0 Optimize DAX Query Performance?

DP-600 By islever Editorial Last updated

Optimize enterprise-scale semantic models

Short answer

B Replacing > 0 with >= 0 changes the query logic but does not reduce execution time.

Question

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution. After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen. You have a Fabric tenant that contains a semantic model named Model1. You discover that the following query performs slowly against Model1. You need to reduce the execution time of the query. Solution: You replace line 4 by using the following code: CALCULATE ( COUNTROWS ( 'Order Item' ) ) >= 0 Does this meet the goal? - Exhibit: Does Replacing > 0 with >= 0 Optimize DAX Query Performance?
  1. Yes
  2. No Correct Answer

Key Takeaways

This question tests DAX performance optimization; the common trap is confusing a logical filter change with a performance improvement.

Replacing a greater-than-zero condition with greater-than-or-equal-to-zero in a DAX CALCULATE function alters the query logic but does not improve execution time. This page confirms that the proposed solution does not meet the performance optimization goal.

Common mistake: Choosing 'Yes' because the code modification executes without error, ignoring that it changes the business logic without reducing execution time.

Expert Analysis

Why the Answer Is Correct

The correct answer is No because the proposed solution changes the filter logic from > 0 to >= 0, which includes customers with zero orders. This alters the query's output and does nothing to optimize the DAX engine's execution plan or reduce the execution time. Performance optimization requires reducing computational load, not changing the filter criteria to be less restrictive.

Why the Other Options Are Wrong

Option A ("Yes") is incorrect because it assumes that modifying the filter condition inherently improves performance. Adding an equals sign simply broadens the result set; it does not speed up how the VertiPaq engine resolves the CALCULATE function. The query still has to evaluate the same relationships and table scans.

Community Comment Notes

The community unanimously agrees that the solution fails to meet the goal. As user VAzureD noted, "By adding the = the only thing we achieve is changing the logic, not the performance." User 282b85d also pointed out that it "does not correctly filter out customers without orders and does not provide an optimization in terms of performance."

Official Reference

https://learn.microsoft.com/en-us/power-bi/guidance/dax-optimizations

This link opens the official vendor documentation in a new tab.

Exam Strategy

When evaluating DAX optimization solutions, strictly separate logic changes from performance improvements. If the proposed code alters the filter context or result set without reducing computational complexity, it does not meet a performance optimization goal.

Community Votes

B
100%

100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 7 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors, not of islever. The comments shown first are the most substantive of the thread — ranked by depth, community endorsement and relevance; expand the list below to read the rest.

From public community threads 7

  1. 282b85d 👍 8 Answered B
    The provided solution does not meet the goal as it does not correctly filter out customers without orders and does not provide an optimization in terms of performance.
  2. VAzureD 👍 4 Answered B
    No. By adding the = the only thing we achieve is changing the logic, not the performance.
  3. bigdave987 👍 3 Answered B
    No, adding the = does not improve performance.
  4. stilferx 👍 3 Answered B
    IMHO, NO, as below in comments
  5. Test_1132 👍 13
    No - Good luck everyone :)
Show 2 more comments
  1. b6daab0 👍 4
    A silly question..
  2. Mitchell12345 👍 3
    Well, we made it boys!

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