S2 Infotech System Engineer Interview Questions and Answers for Experienced

Redux is a predictable state container for JavaScript apps.

• Actions are dispatched to the store

• Reducers update the state based on the action

• Components subscribe to the store to get updated state

ASP.NET page life cycle is a series of events that occur when a page is requested, processed, and rendered.

• Page request is received by the server

• Page is initialized and controls are created

• Page is loaded with data and events are triggered

• Page is rendered and sent to the client

• Page is unloaded and disposed

Join in SQL is used to combine rows from two or more tables based on a related column between them.

• Join is used to retrieve data from multiple tables based on a related column

• Types of join include inner join, left join, right join, and full outer join

• Syntax: SELECT column_name(s) FROM table1 JOIN table2 ON table1.column_name = table2.column_name

• Example: SELECT customers.name, orders.order_id FROM customers JOIN orders

Views in SQL are virtual tables that are based on the result of an SQL statement.

• Views are created using the CREATE VIEW statement.

• They can be used to simplify complex queries.

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

• They can also be used to provide a consistent interface to data from multiple tables.

• Views are updated automatically when the underlying tables are updated.

A function in SQL is a reusable block of code that performs a specific task.

• Functions can be used to manipulate data, perform calculations, and return values.

• They can be created using the CREATE FUNCTION statement.

• Functions can be called within SQL queries or used in stored procedures.

• Examples of SQL functions include AVG, COUNT, and CONCAT.

• Functions can also be user-defined, allowing for custom functionality.