RDSolutions Data Quality Analyst Interview Questions and Answers

Q1. Tell me about 1 project you have worked on and what did you learn during this?
Ans. 
Developed a machine learning model to predict customer churn for a telecom company.
• Collected and cleaned customer data including demographics, usage patterns, and customer service interactions.

• Used various machine learning algorithms such as logistic regression, random forest, and XGBoost to build and evaluate the model.

• Identified key factors contributing to customer churn such as contract length, monthly charges, and ...read more
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Q2. How do you build a recommendation system?
Ans. 
A recommendation system can be built using collaborative filtering, content-based filtering, or hybrid approaches.
• Collect and preprocess data on user preferences and item attributes

• Implement collaborative filtering by recommending items based on user behavior and preferences

• Utilize content-based filtering by recommending items similar to those previously liked by the user

• Consider hybrid approaches that combine collabor...read more
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Done in notepad. Data analysis fundamental and coding fundamentals were covered.

Q1. Piviot tables, vlookups excel case study.
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Q2. Window fucntions SQL question and pandas data manupilation.
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General Aptitude test

Q1. On SQL functions
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Q2. Python coding questions
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Q1. Can you tell me about yourself?
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Basic aptitude question

Q1. Basic analysis and ML questions , more focused on approach instead of coding
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Q1. As like other HR rounds
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Multiple sections on cognitive ability, quant and logical reasoning.
1 coding question

Easy
50% went to next round

Q1. Technical: SQL, DBMS, Basic programming questions- palindrome, fibonacci, discussion on projects and internships
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Q2. Difference between UNION and UNION ALL
Ans. 
UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
• UNION merges the results of two or more SELECT statements and removes duplicates.

• UNION ALL merges the results of two or more SELECT statements without removing duplicates.

• UNION is slower as it has to remove duplicates, while UNION ALL is faster.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column...read more
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Q3. Types of SQL commands
Ans. 
SQL commands include SELECT, INSERT, UPDATE, DELETE, CREATE, and DROP.
• SELECT: retrieves data from a database

• INSERT: adds new records to a table

• UPDATE: modifies existing records in a table

• DELETE: removes records from a table

• CREATE: creates a new table, view, or index

• DROP: deletes a table or index
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Q1. Common HR questions
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Q1. My self and some tec question
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Q1. All tec questions
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2 coding questions in 45 min

Q1. Basics of java and frameworks
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Q2. Basics of SQL and types of queries
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30 min of logical reasoning and basic aptitude

30 min of GD over a general topic to check your communication skills

Q1. Why do you want to join our company
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Q2. Why should we hire you
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