OOP is a design philosophy. It stands for Object Oriented Programming. Object Oriented Programming uses a different set of programming languages than old procedural programming languages. Everything in OOP is grouped as self sustainable objects. Hence you gain re usability by means of four main object-oriented programming concepts.

A key is a single or combination of multiple fields in a table. It is used to fetch or retrieve records data rows from the data table according to the condition requirement. Keys are also used to create a relationship among different database tables or views.

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In SQL Server we have twenty different schema views. These are used to display information of a database like as tables and columns. This type of view starts with INFORMATION SCHEMA and after this view name.

String is an object that represents a group or a sequence of characters. String is represented as a one-dimensional array of characters and ends with a. String is defined in the same way as the other data types. The first step will be to declare a string variable and then assign a value to the variable. The string is an object that belongs to the string class.