Question

• what is sql?
• what is sql server?
• 3 tier architecture of dbms

Explanation:

1. What is SQL?

SQL (Structured Query Language) is a standard programming language for managing and manipulating relational databases. It is used to create, read, update, and delete data (CRUD operations) in databases, as well as to define and control the structure of databases (e.g., creating tables, defining relationships). It's widely used in database systems like MySQL, PostgreSQL, and Oracle.

SQL Server is a relational database management system (RDBMS) developed by Microsoft. It uses SQL to store, retrieve, and manage data. It offers features like data security, transaction management, reporting services, and is used in enterprise-level applications for data storage and management, supporting both on - premise and cloud - based deployments.

The 3 - tier architecture of a Database Management System (DBMS) consists of three layers: the Presentation Layer (handles user interface, like web or desktop apps, presenting data to users and taking user input), the Application Layer (contains business logic, processes user requests, interacts with the database layer, e.g., validating data, implementing business rules), and the Data Layer (manages data storage, retrieval, and security in the database, interacts with the application layer to provide or store data). This architecture separates concerns, improves security, scalability, and maintainability.

Answer:

SQL (Structured Query Language) is a programming language for managing relational databases, used for CRUD operations and database structure definition/control.

2. What is SQL Server?