Senior Programmer Interview Questions and Answers

Duplicate data can be deleted by using SQL queries with the DISTINCT keyword or by writing a script to identify and remove duplicates.

• Use SQL queries with the DISTINCT keyword to select unique records and insert them into a new table.

• Write a script to iterate through the data, identify duplicates based on specific criteria, and delete them.

• Utilize built-in functions or libraries in programming languages like Python or Java to remove duplicate entries.

Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.

• Encapsulation helps in hiding the internal state of an object and only exposing necessary functionalities.

• It allows for better control over the data by preventing direct access from outside the class.

• Encapsulation promotes code reusability and modularity by keeping related data and methods together.

• Example: In a class representing a car, encapsulation would involve private va...read more

Roll back in SQL server is a process of reverting the database to a previous state before a transaction was executed.

• Roll back is used to undo changes made by a transaction that has not been committed.

• It can be done using the ROLLBACK statement in SQL.

• Rolling back a transaction restores the data to its original state before the transaction started.

• Example: ROLLBACK TRANSACTION;

• Roll back is important for maintaining data integrity and consistency in the database.

Transactions in SQL server ensure data integrity by grouping multiple SQL statements into a single unit of work.

• Transactions help maintain data consistency by either committing all changes or rolling them back if an error occurs.

• Use BEGIN TRANSACTION to start a transaction, COMMIT to save changes, and ROLLBACK to undo changes.

• Example: BEGIN TRANSACTION; UPDATE table SET column = value; COMMIT; - commits the changes made in the transaction.

A view in SQL server is a virtual table that contains the result set of a SELECT statement.

• Views are used to simplify complex queries by storing them as a virtual table.

• Views can be used to restrict access to specific columns or rows of a table.

• Views can improve performance by pre-computing expensive queries.

• Example: CREATE VIEW vwEmployee AS SELECT FirstName, LastName FROM Employees;

I have extensive expertise in .Net development.

• Proficient in C# programming language

• Experience with ASP.Net and MVC frameworks

• Familiarity with .Net Core and Entity Framework

• Strong understanding of object-oriented programming

• Knowledge of web services and API integration

• Experience with database technologies like SQL Server

• Ability to troubleshoot and debug .Net applications