HCLTech Senior Software Developer Interview Questions, Process, and Tips for Experienced

Domain Driven Design is an approach to software development that focuses on the core domain and domain logic.

• Focuses on understanding and modeling the core domain of the software

• Emphasizes collaboration between domain experts and developers

• Encourages the use of a common language to bridge the communication gap between technical and non-technical stakeholders

• Promotes the use of domain models to capture and express the c...read more

Use SQL query with window function to find third highest salary of an employee.

• Use ROW_NUMBER() function to assign a unique row number to each record based on salary in descending order

• Filter the result where row number is 3 to get the third highest salary

To find the average salary of employees in a particular department, calculate the total salary of all employees in that department and divide by the number of employees.

• Retrieve the salary of all employees in the particular department

• Calculate the total salary by summing up all individual salaries

• Divide the total salary by the number of employees to get the average salary

An interface is a contract between two components that defines the communication between them.

• It specifies the methods, properties, and events that a component exposes to the outside world.

• It hides the implementation details of a component and provides a standardized way to interact with it.

• It allows for loose coupling between components, enabling them to be developed and tested independently.

• Examples include APIs, GUI

Classes in object-oriented programming are of four types: abstract, concrete, final, and static.

• Abstract classes cannot be instantiated and are used as base classes for other classes.

• Concrete classes can be instantiated and are used to create objects.

• Final classes cannot be inherited and are used to prevent further modification.

• Static classes cannot be instantiated and are used to group related methods and properties.

Views in databases are virtual tables that display data from one or more tables.

• Views are created using SELECT statements.

• They can be used to simplify complex queries.

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

• Changes made to the underlying tables are reflected in the view.

• Examples of views include employee information, customer orders, and product inventory.

Cursors are database objects used to manipulate data in a result set.

• Cursors are used to fetch and manipulate data row by row.

• They are commonly used in stored procedures and triggers.

• Cursors can be forward-only, static, dynamic, or keyset-driven.

• They can be used to update or delete data in a result set.

• However, they can be resource-intensive and should be used sparingly.