Dataeaze Systems Interview Questions and Answers

Q1. Explain your project
Ans. 
Developed a real-time data processing system for analyzing customer behavior on an e-commerce platform.
• Utilized Apache Kafka for real-time data streaming

• Implemented data processing algorithms using Apache Spark

• Designed and maintained data pipelines for ETL processes

• Generated insights for marketing strategies based on customer behavior patterns
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Q2. Sql and data engineerig question
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Q1. Some advanced concepts of spark and sql
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Create tracking system dashboards

Create modified PPT work
Create custom slid size
Editing text or images
Changing the design or layout
changing color or fonts

Q1. Sql query for 2nd highest salary
Ans. 
Retrieve the second highest salary from a database using SQL queries.
• Use the 'DISTINCT' keyword to avoid duplicate salaries.

• Utilize 'ORDER BY' to sort salaries in descending order.

• Use 'LIMIT' or 'OFFSET' to fetch the second highest salary.

• Example SQL: 'SELECT DISTINCT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 1;'
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Q2. Sql query for 3rd highest salary
Ans. 
To find the 3rd highest salary, SQL can use subqueries or the DISTINCT keyword to filter unique salaries.
• Using Subquery: SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees));

• Using DISTINCT: SELECT DISTINCT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 2; This retrieves the 3rd highest salary directly.

• Handling Ties: If t...read more
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I was not that hard i thinks of it

Basic questions of SQL asked in coding test

Q1. Explain your projects you do
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Q2. Tell me about yourself
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