Securly Software (India) Backend Developer Interview Questions and Answers

A view in a database is a virtual table that is based on the result set of a SELECT query.

• Views do not store data themselves, but instead display data from one or more tables based on a query.

• Views can simplify complex queries by pre-defining joins, filters, and calculations.

• Views can also provide security by restricting access to certain columns or rows of a table.

• Example: CREATE VIEW my_view AS SELECT column1, column

Singleton class is a design pattern that restricts the instantiation of a class to one object.

• Singleton class ensures that a class has only one instance and provides a global point of access to it.

• It typically involves a static member variable that holds the single instance of the class.

• The constructor of the class is usually made private to prevent external instantiation.

• Singleton pattern is commonly used in scenarios...read more

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