Epsilon Senior Software Engineer Interview Questions and Answers

Q1. Python, sql, etl, cloud, web tool
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Q1. Functional question and write some sql basic query
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Q1. Basic question on project
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Q1. Salary negotiation and check behaviour qiestion
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Q1. Pivot columns in sql
Ans. 
Pivoting columns in SQL involves transforming rows into columns to display data in a different format.
• Use the PIVOT keyword in SQL to pivot columns

• Specify the columns to pivot on and the values to display in the new columns

• Aggregate functions like SUM, AVG, COUNT can be used with PIVOT

• Example: SELECT * FROM table_name PIVOT (SUM(value_column) FOR pivot_column IN ('value1', 'value2', 'value3'))
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Q2. Slow changing dimensions
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Q3. Dynamic rankx top 3
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Q4. Field parameters
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Q5. Stored procedures
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Q1. Explain oops concepts, difference b/w abstraction and interface,MVC architecture,stored procedure,joins
Ans. 
OOPs concepts, abstraction vs interface, MVC architecture, stored procedures, joins
• OOPs concepts include inheritance, polymorphism, encapsulation, and abstraction

• Abstraction is hiding the implementation details while interface is a contract that defines the methods that a class must implement

• MVC architecture separates the application into Model, View, and Controller components for better organization and maintenance

• Sto...read more
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SQL queries, ddl,dml TCL commands, primary key and foreign key differences,what is composite key,hash table in c#,generics in c#.

Q1. Salary discussion,
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Q1. What is Indexing in Mysql
Ans. 
Indexing in MySQL is a technique to improve the performance of database queries by creating a data structure that allows for faster data retrieval.
• Indexes are created on one or more columns of a table.

• They help in speeding up the search, sorting, and joining of data.

• Indexes can be created using different algorithms like B-tree, hash, or bitmap.

• Using indexes appropriately can significantly enhance query performance.

• Exam...read more
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Q2. Opps concepts in php
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Object-oriented programming concepts in PHP
• Encapsulation: bundling data and methods together in a class

• Inheritance: creating new classes based on existing ones

• Polymorphism: using a single interface to represent different types

• Abstraction: hiding unnecessary details and exposing only essential features

• Class: blueprint for creating objects

• Object: instance of a class

• Method: function defined inside a class

• Property: variabl
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