Oneadvanced Senior Power BI Developer Interview Questions and Answers

Q1. First round Output of table A 1 1 1 1 B 1 1 1 1 1 how you find it and its result 2. 3 ways to find max and second max in sql 3. Row level security on column 4. index in details
Ans. 
The question involves finding the output of a table, ways to find max and second max in SQL, row level security on column, and index in details.
• To find the output of the table, you need to analyze the pattern of the data and count the occurrences of each value for each letter.

• To find the max and second max in SQL, you can use the MAX() function with ORDER BY and LIMIT clauses, or use a subquery to find the second highe...read more
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Q1. Technical Background Evaluation
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Q2. Role level technical questions
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Q1. Azure Data Factory, Kusto Query, Azure SQL
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Q1. Salary Discussion and notice period
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Q1. Scenario based on filter table
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Q2. Find rolling total without reset
Ans. 
Calculate rolling total without resetting at specified interval
• Use DAX formula with functions like CALCULATE, FILTER, and EARLIER

• Create a measure that calculates the running total based on the current and previous rows

• Consider using variables to store intermediate results for efficiency
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Q3. Shift one cell Down in table using dax
Ans. 
Use DAX function to shift one cell down in a table
• Use the LAG function in DAX to shift values down in a column

• Specify the number of rows to shift as a parameter in the LAG function

• Example: LAG([Column], 1) will shift values in 'Column' down by one row
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Q1. Wat is cardinality
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Cardinality refers to the uniqueness of values in a column or relationship.
• Cardinality is the number of unique values in a column or relationship.

• High cardinality means a column has many unique values, while low cardinality means few unique values.

• For example, a column like 'Customer ID' may have high cardinality, while 'Gender' may have low cardinality.
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Q2. Challenges faced
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Q1. Write SQL query
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SQL query to retrieve data from a table
• Use SELECT statement to specify columns to retrieve

• Use FROM statement to specify the table to retrieve data from

• Use WHERE statement to filter the data based on conditions
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Q1. What are duplicates and references
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Duplicates are identical copies of data, while references are pointers to the same data in memory.
• Duplicates are exact copies of the original data.

• References point to the same data in memory.

• Duplicates can lead to inconsistencies in data analysis.

• References are more memory efficient than duplicates.
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Q2. How do you implement incremental refresh
Ans. 
Incremental refresh in Power BI allows for loading only new or modified data to improve performance.
• Set up incremental refresh policy in Power BI Service

• Define a range of values for the refresh policy

• Use parameters to filter data based on the refresh policy

• Schedule regular refreshes to update the dataset
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Q1. What are the components of Power bi
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Power BI components include Power Query, Power Pivot, Power View, Power Map, and Power Q&A.
• Power Query: Used for data extraction and transformation.

• Power Pivot: Used for data modeling and analysis.

• Power View: Used for interactive data visualization.

• Power Map: Used for geographical data visualization.

• Power Q&A: Allows users to ask questions in natural language and get answers from data.
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Q2. What is mean by DAX
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DAX stands for Data Analysis Expressions and is a formula language used in Power BI for creating custom calculations.
• DAX is used to create custom calculations in Power BI, similar to Excel formulas.

• It can be used to create calculated columns, measures, and calculated tables.

• DAX functions can be used to manipulate data, perform calculations, and create complex expressions.

• Examples of DAX functions include SUM, AVERAGE,
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Q3. What is mean by M language
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M language is a powerful data transformation language used in Power Query in Power BI.
• M language is used to transform and clean data in Power BI.

• It is a functional language with a wide range of functions and operators.

• M language is case-sensitive and uses a step-by-step approach to data transformation.

• Examples of M language functions include Table.TransformColumns and List.Transform.
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Medium to hard DA Algo Questions

Q1. Medium level coding question
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Q2. SQL, Python and Oops questions
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It was a real-time scenario that they asked about.