HCL Group Interview Questions, Process, and Tips

Snowflake schema normalizes data into multiple related tables, while Star schema uses a single fact table connected to dimension tables.

• Snowflake schema has normalized dimension tables, reducing data redundancy.

• Star schema has denormalized dimension tables, making queries simpler and faster.

• In Snowflake, a dimension like 'Customer' may be split into 'Customer' and 'Address' tables.

• In Star schema, all attributes of 'Cus...read more

The code has two 'where' statements which is not allowed in SAS.

• Remove one of the 'where' statements to correct the code.

• Combine the conditions using 'and' or 'or' operators if both conditions need to be applied.

The first code calculates the sum of 1, 2, and 7 separately, while the second code calculates the sum of 1, 2, and 7 as a whole.

• Code x=1+.+2+7 calculates the sum of individual numbers (1, 2, 7) separately.

• Code y=sum(1,.,2,7) calculates the sum of all numbers (1, 2, 7) together.

• The first code will result in x=1+2+7=10, while the second code will result in y=1+2+7=10.

I rate myself as proficient in English communication

• I have strong verbal and written communication skills

• I am able to effectively convey complex information in a clear and concise manner

• I am comfortable communicating with colleagues, clients, and stakeholders

• I have experience presenting findings and reports in English

Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.

• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Example: Constructor injection, Setter injection, Interface injection

There are three types of LifeTime Scopes in Dependency Injection: Transient, Scoped, and Singleton.

• Transient: Objects are created each time they are requested.

• Scoped: Objects are created once per request.

• Singleton: Objects are created only once and shared across the application.

Implementing DIP in .NET Core

• Create an interface for the dependency

• Implement the interface in a separate class

• Inject the dependency into the consuming class

• Use dependency injection container to resolve dependencies

CTE stands for Common Table Expressions, a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.

• CTEs are defined using the WITH keyword in SQL.

• They can improve readability and maintainability of complex queries.

• CTEs can be recursive, allowing for hierarchical data querying.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;

• Example: WITH RECURSIVE cte AS (SELECT...read more

Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can have constructors, fields, and methods, while interfaces cannot.

• A class can only extend one abstract class, but it can implement multiple interfaces.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for classes to implem...read more

ls command is used to list files and directories in a directory.

• ls command stands for 'list'.

• It displays the names of files and directories in the current directory by default.

• Options can be used with ls command to customize the output, such as -l for long listing format or -a to show hidden files.

• Example: 'ls -l' will display files and directories in long listing format.

DNS translates domain names to IP addresses to locate resources on the internet.

• DNS servers store records mapping domain names to IP addresses

• When a user enters a domain name, their device queries a DNS server to resolve it

• DNS uses a hierarchical system with top-level domains like .com or .org

Yes, we can use commit in user exit to save data changes to the database.

• Commit can be used in user exits to save changes made to the database within the exit.

• It is important to use commit carefully in user exits to avoid data inconsistencies.

• Example: Using commit in a user exit after updating a table to ensure the changes are saved.

Seeking new challenges and opportunities for growth.

• Desire for career advancement

• Looking for new challenges

• Seeking better work-life balance

• Company restructuring or downsizing

• Relocation to a new area

I was paid a competitive salary based on my experience and qualifications.

• My salary was based on my level of experience and qualifications

• I received a competitive salary compared to industry standards

• I was satisfied with my salary package