Power Bi Dax Interview Questions
Power BI DAX Interview Question Examples
Power Bi Dax Interview Questions
Power BI DAX (Data Analysis Expressions) interview questions often focus on querying and manipulating data in Power BI, understanding DAX functions, writing complex calculations, creating measures and calculated columns, optimizing data models, and troubleshooting issues. Common questions might include demonstrating proficiency in writing DAX formulas, explaining the difference between calculated columns and measures, handling different types of relationships in Power BI, and optimizing performance. Interviewers may also ask about scenario-based questions to test problem-solving skills and ability to apply DAX functions effectively to real-world data challenges. Being well-versed in DAX concepts, formulas, and best practices is crucial for candidates preparing for Power BI DAX interviews.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - What is DAX and how is it different from SQL? DAX, which stands for Data Analysis Expressions, is a formula language used in Power BI for creating and manipulating data models. Unlike SQL, which is used for querying databases, DAX is specifically designed for working with tabular data models.
2) Explain the difference between calculated columns and measures in Power BI. Calculated columns are virtual columns that are created within a table in the data model, while measures are calculations that are performed on the fly based on the context of the data being displayed. Calculated columns are calculated once when the data is loaded, whereas measures are recalculated dynamically as needed.
3) What is the difference between CALCULATE and FILTER functions in DAX? CALCULATE is a powerful function in DAX that allows you to modify the filter context of a calculation, while FILTER is used to return a table that meets specific criteria. CALCULATE can be used to apply additional filters or to modify the context in which a calculation is being performed.
4) How do you handle relationships in a Power BI data model? Relationships in Power BI are established based on common fields between tables. You can create relationships using the Manage Relationships dialog in Power BI to define how tables are related to each other. It is important to ensure that relationships are properly defined to avoid incorrect results in your reports.
5) Explain the difference between row context and filter context in DAX. Row context is created when iterating through individual rows in a table, while filter context is created based on the filters applied to the data. Understanding the difference between row and filter context is crucial for writing effective DAX formulas in Power BI.
6) How can you optimize DAX queries for better performance in Power BI? Optimizing DAX queries involves techniques such as reducing the number of calculated columns, avoiding unnecessary calculations, and minimizing the use of volatile functions. Additionally, optimizing relationships and using proper data modeling techniques can improve query performance in Power BI.
7) What are some common DAX functions used for calculations in Power BI? Some common DAX functions include SUM, AVERAGE, CALCULATE, FILTER, RELATED, DATEDIFF, and COUNTROWS. These functions can be used for a variety of calculations and aggregations in Power BI reports and visuals.
8) How do you handle error handling in DAX formulas? Error handling in DAX can be done using functions such as IFERROR, ISERROR, and ISBLANK to handle potential errors or blank values in your calculations. By incorporating error handling into your DAX formulas, you can ensure that your reports are more robust and accurate.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
- Message us on Whatsapp: +91 9987184296
- Email id: info@justacademy.co
Java Interview Questions For 1 Year Experience
Python Scripting Interview Questions
Wordpress Interview Questions And Answers
Javascript Object Interview Questions
