Collman Services Software Engineer Interview Questions and Answers

Q1. What is dependency injection
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing a way to mock dependencies.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.
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Q1. Explain solid principles
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SOLID principles are a set of five design principles that help make software more maintainable, flexible, and scalable.
• Single Responsibility Principle (SRP) - a class should have only one reason to change

• Open/Closed Principle (OCP) - classes should be open for extension but closed for modification

• Liskov Substitution Principle (LSP) - objects of a superclass should be replaceable with objects of its subclasses without a...read more
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Q1. Square root of 23490?
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The square root of 23490 is approximately 153.2.
• Calculate the square root of 23490 using a calculator or math function

• The square root of 23490 is approximately 153.2
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Q1. Basic Questions related to RPA
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Q1. What are your salary expectations?
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Q2. Tell me about yourself.
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Q3. Why do you left your previous job?
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Q4. How many years of experience do you have?
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Q5. What are the domains you have worked on?
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I have worked on domains like e-commerce, finance, and healthcare.
• E-commerce: developed an online shopping platform with payment gateway integration

• Finance: worked on a trading platform with real-time data analysis

• Healthcare: developed a patient management system for a hospital
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Q1. Do you know What is dml?
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DML stands for Data Manipulation Language.
• DML is a subset of SQL used to manipulate data in a database.

• It includes commands like INSERT, UPDATE, DELETE, and SELECT.

• DML is used to modify the data stored in tables.

• DML commands are used in conjunction with Data Definition Language (DDL) commands.

• Examples of DML commands include: INSERT INTO, UPDATE SET, DELETE FROM, and SELECT WHERE.
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Q2. What are types of indexes in sql server? What is clustered index?
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Types of indexes in SQL Server and definition of clustered index.
• Types of indexes: clustered, non-clustered, unique, filtered, columnstore, full-text

• Clustered index determines physical order of data in table

• Only one clustered index per table

• Primary key is automatically a clustered index if not specified otherwise
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Q3. What is denormalization? What are the advantages of denormalization?
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Denormalization is the process of adding redundant data to improve query performance.
• Reduces the number of joins required to retrieve data

• Improves read performance

• Increases data redundancy

• May require additional effort to maintain data consistency
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Q4. What is a cross join?
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A cross join returns the Cartesian product of two tables.
• It combines each row of one table with every row of another table.

• It does not use any join condition.

• It can result in a large number of rows if the tables are large.

• Syntax: SELECT * FROM table1 CROSS JOIN table2;

• Example: SELECT * FROM employees CROSS JOIN departments;
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Q5. What is corelated and non corelated query?
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Corelated queries use data from multiple tables, while non-corelated queries use data from a single table.
• Corelated queries involve joining tables to retrieve data

• Non-corelated queries involve selecting data from a single table

• Corelated queries are typically slower than non-corelated queries

• Examples of corelated queries include inner join, left join, and right join

• Examples of non-corelated queries include select, inser
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Q6. What are views in sql server?
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Views are virtual tables that display data from one or more tables in a database.
• Views are created using SELECT statements.

• They can be used to simplify complex queries.

• They can also be used to restrict access to sensitive data.

• Views do not store data themselves, but rather display data from underlying tables.

• They can be used to join multiple tables together.

• Views can be updated, but there are some restrictions.

• They can...read more
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Q7. What is difference between sp and function?
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SP is used to execute a set of SQL statements, while function returns a single value.
• SP can have input/output parameters, while function can only have input parameters.

• SP can modify data, while function cannot.

• SP can be used to execute multiple SQL statements, while function can only execute a single SQL statement.

• Functions can be used in SELECT statements, while SP cannot.

• Examples of functions include SUM, AVG, and CO...read more
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Q8. What is data warehousing?
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Data warehousing is the process of collecting, storing, and managing data from various sources for business intelligence purposes.
• Data warehousing involves extracting data from different sources and transforming it into a format suitable for analysis.

• The data is then stored in a central repository called a data warehouse.

• Data warehousing enables businesses to make informed decisions based on historical and current data...read more
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