Data Lumina Data Analyst Interview Questions and Answers for Experienced

Q1. I have finished Btech in Cse AI&ML taken datascience course looking for job
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NLP is my favorite subject. Is relatated medical and sign language. I have done reseach with mechien learning and AI TOOLS used for problem solving approach.

A group discussion was conducted on data-based management regarding Mr. Adani's food industry products in the state of Gujarat and their exports to other countries, utilizing data analytics.

Q1. How to perform Set Actions, LOD's
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Q1. Explain difference between joins
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Q2. What is your area of intrest
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Q1. Write a code to determine average salary wrt location
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Code to calculate average salary based on location
• Create a dictionary to store salaries based on location

• Calculate average salary for each location using the dictionary

• Return the average salaries for each location
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Q1. Calculate avg value and standard deviation from given data
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Calculate avg value and standard deviation from given data
• Calculate the average value by summing all data points and dividing by the total number of data points

• Calculate the standard deviation by finding the square root of the average of the squared differences between each data point and the mean

• Example: Data points - 5, 7, 9, 11. Average = (5+7+9+11)/4 = 8. Standard deviation = sqrt(((5-8)^2 + (7-8)^2 + (9-8)^2 + (11
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Q2. From given graph answer below questions
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Q1. What is Primary key and foreign key?
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Primary key uniquely identifies each record in a table, while foreign key establishes a link between two tables.
• Primary key ensures each record in a table is unique

• Foreign key establishes a relationship between two tables

• Primary key can be a single column or a combination of columns

• Foreign key references the primary key of another table
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Q2. What is Artificial intelligence?
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Artificial intelligence is the simulation of human intelligence processes by machines, especially computer systems.
• AI involves machines performing tasks that typically require human intelligence, such as visual perception, speech recognition, decision-making, and language translation.

• Examples of AI include virtual assistants like Siri and Alexa, self-driving cars, recommendation systems like Netflix's algorithm, and fa...read more
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Q1. Why did you choose Capgemini?
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Q1. What are the different kinds of joins
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Different kinds of joins include inner join, outer join, left join, and right join.
• Inner join: Returns only the rows that have matching values in both tables.

• Outer join: Returns all rows when there is a match in one of the tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.
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Q2. What is the difference between columns and measures in power BI
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Columns are the fields in a dataset, while measures are calculations based on those fields in Power BI.
• Columns are the raw data fields in a dataset, such as 'Sales Amount' or 'Product Category'.

• Measures are calculations performed on columns, like sum, average, count, etc.

• Measures are created using DAX (Data Analysis Expressions) in Power BI.

• Columns are used for grouping, filtering, and slicing data, while measures are
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Q3. How can you remove duplicates in sql
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Use the DISTINCT keyword in a SELECT statement to remove duplicates in SQL.
• Use the DISTINCT keyword in a SELECT statement to retrieve unique values.

• Example: SELECT DISTINCT column_name FROM table_name;

• Another way is to use the GROUP BY clause to remove duplicates.

• Example: SELECT column_name FROM table_name GROUP BY column_name;
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