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📊 Power BI Interview Questions & Answers (Advanced Level 51–100) #15
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📊 Power BI Interview Questions & Answers (Advanced Level 51–100)
A structured and interview-focused collection of Power BI Intermediate Level Questions & Answers designed for:
This section covers Data Modeling, DAX, RLS, Service, Refresh, and Performance concepts.
📌 Why This Repository?
✔ Interview-focused answers
✔ Clear and practical explanations
✔ Covers real-world scenarios
✔ Beginner → Intermediate → Advanced structure
✔ SEO-optimized for GitHub discoverability
📌 Question List (51–100)
📘 Detailed Questions & Answers
51. What is Context Transition in DAX?
Context transition converts row context into filter context, usually inside
CALCULATE().It allows row-based calculations to behave like filtered aggregations.
52. What Are Iterator Functions?
Iterator functions evaluate expressions row by row.
Examples:
53. What is EARLIER Function?
EARLIER references an outer row context in calculated columns.
It is largely replaced by
VARin modern DAX.54. What is TREATAS Function?
TREATAS applies the result of one table as a filter to another table.
Useful when no physical relationship exists.
55. What is USERELATIONSHIP?
Activates an inactive relationship inside CALCULATE.
56. What is CROSSFILTER?
Temporarily changes filter direction between related tables.
57. What Are Variables (VAR)?
Variables store intermediate results to:
58. What is a Disconnected Table?
A table with no relationships.
Used for:
59. What is a Virtual Table?
A temporary table created during DAX calculation using:
60. What is SUMMARIZE?
Groups data similar to SQL GROUP BY.
61. What is ADDCOLUMNS?
Adds calculated columns to an existing table expression.
62. SUMMARIZE vs GROUPBY
63. What is Performance Analyzer?
A tool in Power BI to measure:
64. How to Optimize Reports?
65. What is VertiPaq Engine?
The in-memory storage engine of Power BI.
Provides high compression and fast query performance.
66. What is Storage Mode?
67. What is Aggregation Table?
Pre-aggregated data used to improve performance in large datasets.
68. What is Bidirectional Filtering Problem?
Can cause:
69. What Are Calculation Groups?
Used to apply reusable calculations like YTD, MTD, YOY.
Created using Tabular Editor.
70. What is Tabular Editor?
External tool for:
71. What is ALLEXCEPT?
Removes all filters except specified columns.
72. What is REMOVEFILTERS?
Clears filters from specific tables or columns.
73. What is KEEPFILTERS?
Adds filters without removing existing filter context.
74. What is RANKX?
Ranks values dynamically based on an expression.
75. What is TOPN?
Returns top N rows based on sorting expression.
76. What is Dynamic Measure Switching?
Allows switching measures dynamically using slicers.
77. What is Field Parameter?
Allows dynamic switching of fields in visuals.
78. Composite Model Limitation?
79. What is Large Dataset Storage Format?
Optimized storage format for very large models.
Available in Premium capacity.
80. What is Incremental Refresh Policy?
Defines historical data storage and refresh behavior.
81. What is XMLA Endpoint?
Allows external tools to connect to Power BI datasets.
82. What is Deployment Pipeline?
Dev → Test → Production lifecycle management tool.
83. What is Dataflow?
Reusable ETL process created in Power BI Service.
84. What is Shared Dataset?
A dataset reused across multiple reports.
85. What is Paginated Report?
Pixel-perfect report used for printing and operational reporting.
86. What is Query Folding?
Power Query pushes transformations back to the data source.
87. How to Improve Query Folding?
88. What is Direct Lake Mode?
Fabric feature combining Import performance with near real-time access.
89. What is Microsoft Fabric Integration?
Unified analytics platform integrating Power BI with Lakehouse and Data Engineering.
90. What is Sensitivity Label?
Data classification feature for governance and compliance.
91. What is Object-Level Security (OLS)?
Restricts access to specific tables or columns.
92. What is Dynamic RLS?
Row-level security based on logged-in user identity.
93. What is Composite Key?
Using multiple columns to create a unique relationship key.
94. What is Calculation Precedence?
Defines execution order when multiple calculation groups are applied.
95. What is Semantic Model?
A business-ready optimized data model used for reporting.
96. What is Role-Playing Dimension?
A single dimension used multiple times (e.g., Order Date, Ship Date).
97. What is Many-to-Many Relationship Issue?
Can cause incorrect aggregations and performance issues.
Solved using bridge tables.
98. What is DAX Studio?
Tool for:
99. How to Handle Circular Dependency?
100. Best Practices for Enterprise Power BI Development
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