HCL Group Data Analyst Interview Questions and Answers

Sql python bigdata hadoop hive spark

1 hour simple coding python sql

Q1. Advantages of sql
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SQL allows for efficient data retrieval, manipulation, and analysis in relational databases.
• SQL is widely used in querying databases to retrieve specific data.

• It allows for data manipulation, such as adding, updating, and deleting records.

• SQL can perform complex data analysis tasks, such as aggregations and joins.

• It provides a standardized language for interacting with relational databases.

• SQL is essential for generati...read more
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Q2. Advantages of python
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Python is a versatile programming language known for its simplicity, readability, and vast library support.
• Easy to learn and use, making it ideal for beginners and experienced programmers alike

• Extensive library support for data analysis, machine learning, web development, and more

• Strong community support with active forums and resources for problem-solving

• Cross-platform compatibility allows for seamless integration wit...read more
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Q3. Spark and its benefits
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Spark is a fast and powerful big data processing framework that offers benefits like speed, ease of use, and versatility.
• Spark is known for its speed, as it can process data up to 100 times faster than traditional Hadoop MapReduce.

• It offers ease of use with high-level APIs in Java, Scala, Python, and SQL, making it accessible to a wide range of users.

• Spark is versatile, supporting various workloads such as batch proces...read more
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Q4. Why to leave the company
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Q5. Huddles of data engineer
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Huddles of data engineers refer to collaborative meetings or discussions among data engineers to share insights, solve problems, and make decisions.
• Huddles are typically informal and can be scheduled or ad-hoc.

• They provide a platform for data engineers to brainstorm, troubleshoot, and exchange ideas.

• Huddles may involve reviewing code, discussing data pipelines, or addressing technical challenges.

• Effective huddles promo...read more
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Q1. What is the importance of data analysis?
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Q2. What steps should be taken to become a data analyst?
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Q1. Python and sql related question
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Q1. Pandas numpy visualisation sql
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Alteryx data processing and reporting

Online aptitude test with maths and statistics and data analysis

Q1. Joins sql groups python numpy pandas
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Q1. What is star topology
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Q2. Hybrid topology
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Logical,verbal,quants

Q1. What is lambda function
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Q2. What is subquary
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Q1. What is powerbi
Ans. 
Power BI is a business analytics tool by Microsoft that provides interactive visualizations and business intelligence capabilities.
• Power BI is a data visualization tool used to create interactive reports and dashboards.

• It allows users to connect to various data sources, clean and transform data, and create visually appealing reports.

• Users can share and collaborate on reports with others, and access them on multiple dev...read more
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Q2. What is enumeration
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Enumeration is the process of listing items in a specific order or sequence.
• Enumeration is commonly used in programming to iterate through a list of items.

• It helps in organizing and categorizing data for analysis.

• Examples include counting the number of occurrences of specific values in a dataset.
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