Power BI Interview Questions and Answers

Explore the Power BI Fundamentals: A Comprehensive Guide

This course provides a thorough understanding of Power BI, covering essential concepts and techniques to build insightful reports. We'll delve into data transformation, DAX calculations, and report design to empower you to unlock the power of your data.

Key Topics Covered:

• Calculated Columns: Learn how to create new columns based on existing data within your Power BI tables. Understand where and how to implement calculated columns for data manipulation.
• Calculated Measures: Discover how to define custom calculations using DAX (Data Analysis Expressions). Learn where to create measures and their importance in Power BI reporting.
• Power Query (M Code): Master Power Query, the data transformation engine in Power BI. Understand M code and where to write it to clean, shape, and prepare your data for analysis.
• Parameters: Explore the use of parameters in Power BI to create dynamic and interactive reports.
• Power BI Data Gateway: Understand the role of the Power BI Data Gateway in connecting to on-premises data sources and the necessity for scheduled refresh.
• Query Folding: Learn about query folding and how it optimizes data retrieval performance in Power BI.
• Split Function: Discover the utility of the Split function in Power BI for separating data into multiple columns.
• Filters in Power BI: Understand the different types of filters (visual level, page level, and report level) and how to apply them effectively.
• ALL & ALL EXCEPT Functions: Learn to use ALL and ALL EXCEPT functions for flexible filtering scenarios.
• Grouping: Master grouping techniques in Power BI to aggregate and summarize data.
• What-If Parameter: Explore the power of "What-If" parameters for scenario planning and data exploration.
• Distinct Values: Understand the difference between Distinct and Values in Power BI for data analysis.

Advanced DAX & Power Query Techniques:

• DAX Fundamentals: Get acquainted with DAX, the formula language of Power BI, and commonly used DAX functions.
• Power Query Deep Dive: Explore advanced Power Query techniques for data manipulation and transformation.
• Types of Filters: Learn about various filter types available in Power BI reports.
• Sum vs. SUMX: Understand the difference between SUM and SUMX functions in Power BI.
• Import Query vs. DirectQuery: Compare and contrast Import and DirectQuery modes in Power BI and when to use each.
• Append Query vs. Merge Query: Learn the difference between appending and merging queries in Power Query and various join types.
• LookupValue DAX Function: Master the LookupValue DAX function for retrieving values from related tables.
• DatesBetween vs. DatesInPeriod: Understand the nuances of DatesBetween and DatesInPeriod functions in DAX.
• Essential DAX Functions: Gain proficiency in commonly used DAX functions like COUNTA, COUNTX, COUNTX, COUNTBLANK, DISTINCTCOUNT, and COUNTROWS.
• Top N Filtering: Learn how to filter the top N records in Power BI.
• USERELATIONSHIP vs. TREATAS: Understand the difference between USERELATIONSHIP and TREATAS functions.
• Bookmarks: Discover how to use bookmarks to create custom navigation and report views.
• Variables in Power BI: Explore the use of variables in DAX for improving formula readability and performance.
• Power Pivot vs. Power Query (Unpivot): Understand the differences between Power Pivot and Power Query (Unpivot) for data modeling and transformation.
• Table Joins: Learn about different types of table joins, including Crossjoin, Union, Except, and Intersect.
• DAX RANKX Function: Master the RANKX function for ranking data within Power BI.
• Calculate DAX Function: Learn how to use the Calculate DAX function in Power BI.
• RELATED vs. RELATEDTABLE: Understand the difference between RELATED and RELATEDTABLE functions.
• DATEADD & PARALLELPERIOD Functions: Explore the use of DATEADD and PARALLELPERIOD functions for time intelligence calculations.

This course is designed to equip you with the skills to create powerful and insightful Power BI reports. Stay tuned for updates with new videos covering advanced topics like Time Intelligence, Dashboards, and Row Level Security! Subscribe to stay updated.