Wipro Lead Data Engineer Interview Questions, Process, and Tips

Q1. Given a DataFrame df with columns 'A', 'B','C' how would you group the data by the values in column 'A' and calculate the mean of column 'B' for each group, while also summing the values in column 'C' ?
Ans. 
Group data by column 'A', calculate mean of column 'B' and sum values in column 'C' for each group.
• Use groupby() function in pandas to group data by column 'A'

• Apply mean() function on column 'B' and sum() function on column 'C' for each group

• Example: df.groupby('A').agg({'B':'mean', 'C':'sum'})
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Q2. Explain the difference deepcopy() and copy() methods in Python's copy module. Provide a scenario where you would use deepcopy() over copy().
Ans. 
deepcopy() creates a new object with completely independent copies of nested objects, while copy() creates a shallow copy.
• deepcopy() creates a new object and recursively copies all nested objects, while copy() creates a shallow copy of the top-level object only.

• Use deepcopy() when you need to create a deep copy of an object with nested structures, to avoid any references to the original object.

• Use copy() when you only ...read more
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Q3. Discuss the concept of Python decorators and provide an example of how you would use decorators to measure the execution time of a function.
Ans. 
Python decorators are functions that modify the behavior of other functions. They are commonly used for adding functionality to existing functions without modifying their code.
• Decorators are defined using the @ symbol followed by the decorator function name.

• They can be used to measure the execution time of a function by wrapping the function with a timer decorator.

• Example: def timer(func): def wrapper(*args, **kwargs...read more
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Q1. Questions related to the current and past projects.
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Q2. Aws related questions.
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Q3. Data warehousing basics
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Q1. Explain about the roles and responsibilities.
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Q2. Discussion about the role in Genpact.
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Q1. Asked about expectated salary
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Q2. Why are you switching
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Q1. Data Modeling Concepts, SQL Query
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Q2. Data Governance, Data Lineage, ETL process,
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SQL Scripts to write and also also asked to design an data model of my choice in Telecom Domain

Q1. Architecture of sql
Ans. 
SQL architecture refers to the structure and components of a SQL database system.
• SQL architecture includes components like storage engine, query processor, and buffer manager.

• The storage engine manages data storage and retrieval, while the query processor processes SQL queries.

• The buffer manager handles caching and memory management to optimize performance.

• Examples of SQL architectures include MySQL, Oracle, and SQL Se
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Q2. Recovery models
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Test your algorithmic thinking and problem solving skills

Q1. Communications,clearity of answers
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Q1. Discussion about packages,joining date
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Q1. Data stage scenario
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Q2. Difference between Data Stage and informatica
Ans. 
Data Stage is an ETL tool by IBM, while Informatica is a popular ETL tool by Informatica Corporation.
• Data Stage is developed by IBM, while Informatica is developed by Informatica Corporation.

• Data Stage is known for its parallel processing capabilities, while Informatica is known for its ease of use and flexibility.

• Data Stage has a graphical interface for designing jobs, while Informatica uses a more traditional workflo...read more
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Q1. Tell about yourself
Ans. 
Experienced Oracle DBA with 5+ years of hands-on experience in managing databases, optimizing performance, and ensuring data security.
• 5+ years of experience as an Oracle DBA

• Proficient in database management, performance optimization, and data security

• Skilled in troubleshooting and resolving database issues

• Strong knowledge of Oracle database architecture and SQL

• Certified Oracle Database Administrator (OCA/OCP)
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