Affine Interview Questions, Process, and Tips

Q1. What are the types of data set you have worked upon?
Ans. 
I have worked on various types of data sets including sales data, customer data, financial data, and social media data.
• Sales data

• Customer data

• Financial data

• Social media data
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Q2. Write dax for delta sales growth
Ans. 
Calculate delta sales growth using DAX formula
• Use the following DAX formula: Delta Sales Growth = (SUM(Sales[SalesAmount]) - CALCULATE(SUM(Sales[SalesAmount]), PREVIOUSMONTH('Date'[DateKey]))) / CALCULATE(SUM(Sales[SalesAmount]), PREVIOUSMONTH('Date'[DateKey]))

• Make sure to replace 'Sales[SalesAmount]' with the actual column name in your dataset

• Ensure that 'Date'[DateKey]' is the date column in your dataset
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The first round was a combination of MCQs and SQL Coding test. It consisted of 23 MCQs on SQL, 10 MCQs on Power BI and 5 SQL Coding questions.

Q1. Simple questions on SQL were asked.
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Q1. What is pivot table in Excel?
Ans. 
A pivot table in Excel is a data summarization tool that allows you to reorganize and summarize selected columns and rows of data.
• Pivot tables allow you to analyze and summarize large amounts of data in a spreadsheet.

• You can easily rearrange the layout of the data to view it from different perspectives.

• Pivot tables can perform functions like sum, average, count, and more on the data.

• They are useful for creating reports...read more
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Q2. What is 'Data Validation' in Excel?
Ans. 
Data Validation in Excel ensures that data entered in a cell meets certain criteria or conditions.
• Data Validation allows you to set rules for what can be entered in a cell, such as a range of values, a list of items, or a custom formula.

• Examples of Data Validation include setting a drop-down list of options for a cell, restricting input to a certain number range, or ensuring dates are entered in a specific format.

• Data ...read more
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Q3. What is the order of execution of an SQL query?
Ans. 
The order of execution of an SQL query involves multiple steps to retrieve data from a database.
• 1. Parsing: The SQL query is first parsed to check for syntax errors.

• 2. Optimization: The query optimizer creates an execution plan to determine the most efficient way to retrieve data.

• 3. Compilation: The optimized query is compiled into an executable form.

• 4. Execution: The compiled query is executed by the database engine t...read more
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Q4. What is the difference between Tree Map and Heatmap in Tableau?
Ans. 
Tree Map visualizes hierarchical data using nested rectangles, while Heatmap displays data values using color gradients.
• Tree Map displays data hierarchically with nested rectangles, where the size and color represent different measures.

• Heatmap visualizes data values using color gradients, with darker colors indicating higher values.

• Tree Map is useful for showing hierarchical data structures, while Heatmap is effective ...read more
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Q5. What is the difference between 'Extract Data' and 'Live Connection' in Tableau?
Ans. 
Extract Data saves a snapshot of data in Tableau workbook, while Live Connection directly connects to data source.
• Extract Data creates a static copy of data in Tableau workbook, while Live Connection directly queries data source in real-time.

• Extract Data is useful for working offline or with small datasets, while Live Connection is ideal for large datasets or when data is frequently updated.

• Extract Data can improve per...read more
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Q1. What is dual mode in Power BI
Ans. 
Dual mode in Power BI allows users to switch between DirectQuery and Import modes for data sources.
• Dual mode allows users to combine the benefits of both DirectQuery and Import modes in Power BI.

• Users can switch between DirectQuery and Import modes for different data sources within the same report.

• DirectQuery mode connects directly to the data source for real-time data retrieval, while Import mode loads data into Power...read more
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Q1. I don't know why they rejected me
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Q2. What ever they asked me for coding part the output is correct and logic is also correct
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Q1. What is self-join
Ans. 
Self-join is a SQL query that joins a table to itself.
• Self-join is used when a table needs to be joined with itself to compare rows within the same table.

• It is achieved by using table aliases to differentiate between the two instances of the same table.

• Commonly used in hierarchical data structures or when comparing related records within the same table.
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Q1. What is a stored procedure
Ans. 
A stored procedure is a set of SQL statements that are stored in a database and can be called by other programs or scripts.
• Stored procedures can improve performance by reducing network traffic and executing complex operations on the database server.

• They can be used to encapsulate business logic and enforce security measures.

• Example: CREATE PROCEDURE GetCustomerOrders AS SELECT * FROM Orders WHERE CustomerID = @Customer
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Q1. What is difference between DROP and TRUNCATE statements?
Ans. 
DROP deletes the table structure and data, while TRUNCATE deletes only the data.
• DROP statement removes the table from the database, including all data and structure.

• TRUNCATE statement removes all data from the table, but keeps the table structure intact.

• DROP is a DDL (Data Definition Language) command, while TRUNCATE is a DML (Data Manipulation Language) command.
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Q1. SQL and excel questions intermediate
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Easy SQL questions related to sub query

SQL moderate questions related to joins and window functions

Q1. Asked about specific tools related to requirement
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