Mercer HR Data Analyst Interview Questions and Answers

Q1. Big data , Optimization , Python basic , SQL intermediate
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Q2. Find max and min number without sorting Joins related Big data handling Optimization question
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Q1. Schema , python , sql
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Q2. Case study sql and python based
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Sales data from a leading manufacturer

Q1. What is spark,explain its ecosystem
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Q2. What are transformations, and how many types of transformations exist?
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Q3. Explain about spark job process and its planning
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Q4. What are the concepts of coalesce and repartition in data processing?
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Q5. Explain about oom and driverhead memory
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Q6. What is data skewness
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Q1. Sql order of execution
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SQL order of execution determines the sequence in which different clauses are processed in a query.
• SQL query is parsed and validated first

• Next, the query optimizer creates an execution plan

• Execution plan includes steps like table scans, index scans, joins, etc.

• Finally, the query is executed and results are returned
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Q2. Sql question on finding highest salary for each employee where employees and department table are given in each department.
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Normal aptitude round

Q1. SQL 4 QUESTION 1 BASIC 3 INTERMIDATE
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Q2. DATA WAREHOUSE DETAILS ITS IMP THEY WORK ON THIS SO ASK ALL INFO ABOUT THIS
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Q1. Project related discussions
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Q2. Meduim level SQl and DSA
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Q1. This was data modelling round
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Q2. Design a uber data model
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Uber data model design for efficient storage and retrieval of ride-related information.
• Create tables for users, drivers, rides, payments, and ratings

• Include attributes like user_id, driver_id, ride_id, payment_id, rating_id, timestamp, location, fare, etc.

• Establish relationships between tables using foreign keys

• Implement indexing for faster query performance
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Three sections are there 1) Aptitude Test 2) SQL 3) DSA

Q1. What is DSA , sorting , difference between array and linked list
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DSA stands for Data Structures and Algorithms. Sorting is the process of arranging data in a particular order. Array is a data structure that stores elements of the same data type in contiguous memory locations, while linked list is a data structure that stores elements in nodes with pointers to the next node.
• DSA stands for Data Structures and Algorithms

• Sorting is the process of arranging data in a particular order

• Arra...read more
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Q2. Written a SQL query
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Q1. Coding question like add numbers
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Q2. Experience on your project
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I have experience working on various data analysis projects, including market research, customer segmentation, and predictive modeling.
• Developed predictive models to forecast customer behavior and optimize marketing strategies

• Conducted market research to identify trends and opportunities for growth

• Performed customer segmentation analysis to target specific demographics with personalized marketing campaigns
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Q1. Power BI Difference between ALL() and ALLSELECTED()
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ALL() ignores all filters in the query context, while ALLSELECTED() ignores only filters on columns in the visual.
• ALL() removes all filters from the specified column or table.

• ALLSELECTED() removes filters from the specified column or table, but keeps filters on other columns in the visual.

• Example: ALL('Table') would remove all filters on the 'Table' in the query context.

• Example: ALLSELECTED('Column') would remove filte...read more
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Q2. Excel Difference between COUNT() and COUNTA()
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COUNT() counts only numeric values, while COUNTA() counts all non-empty cells.
• COUNT() counts only cells with numerical values.

• COUNTA() counts all non-empty cells, including text and errors.

• Example: COUNT(A1:A5) will count only cells with numbers, while COUNTA(A1:A5) will count all non-empty cells.
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Q1. Resume based questions like explain the projects that you have done.
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Q2. Sample dataset questions
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Maxium sub string and reverse a string