_VOIS Data Analyst Interview Questions and Answers for Experienced

Simple sql question from rank

Q1. Related to market,trending hotels,car selling websites etc
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Q2. Nothing else was asked
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Q1. What is sql
Ans. 
SQL (Structured Query Language) is a standard programming language for managing and manipulating relational databases.
• SQL is used to query, insert, update, and delete data in databases. Example: SELECT * FROM users;

• It allows for data definition and manipulation through commands like CREATE, ALTER, and DROP. Example: CREATE TABLE orders (id INT, amount DECIMAL);

• SQL supports complex queries with JOIN operations to combin...read more
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Q2. Data warehouse in sql
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A data warehouse is a centralized repository for storing and analyzing large volumes of structured and unstructured data.
• Data warehouses integrate data from multiple sources, such as databases, CRM systems, and flat files.

• They support complex queries and data analysis, enabling businesses to make informed decisions.

• Data is organized in a star or snowflake schema, optimizing query performance.

• ETL (Extract, Transform, Lo...read more
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The best I can say is fantastic

They asked me about the advertisement and to decode

Q1. What is the importance of data analysis?
Ans. 
Data analysis is crucial for making informed decisions, identifying trends, and solving complex problems.
• Helps in making informed decisions based on data-driven insights

• Identifies trends and patterns that can lead to strategic business decisions

• Aids in solving complex problems by analyzing data to find root causes

• Improves efficiency and effectiveness of processes through data-driven optimizations
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Q2. What steps should be taken to become a data analyst?
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To become a data analyst, one should focus on acquiring relevant education, gaining experience with data analysis tools, and developing strong analytical and problem-solving skills.
• Obtain a degree in a related field such as statistics, mathematics, computer science, or data science.

• Gain experience with data analysis tools such as SQL, Python, R, and Excel.

• Develop strong analytical and problem-solving skills by working ...read more
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Python, statistics and logics

Q1. Ecxplain classification model in ml
Ans. 
Classification model in machine learning is used to predict the category or class of new data based on past observations.
• Classification models are supervised learning algorithms that learn from labeled data to predict the class or category of new data points.

• Common classification algorithms include logistic regression, decision trees, random forests, support vector machines, and k-nearest neighbors.

• Evaluation metrics f...read more
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Q1. Sql basic questions - join , index, optimisation
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Q1. Basic non technical With director
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