Top SQL Interview Questions and Answers

1. What is Database?

A database is a structured collection of organized and interconnected data. It efficiently stores, manages, and retrieves information. Data is organized into tables with rows and columns. Databases ensure data integrity, support concurrent access, and offer security and backup features. They are essential for storing and managing data for applications and decision-making processes.

2. What is DBMS?

DBMS stands for Database Management System. It is software that enables the creation, management, and manipulation of databases. DBMS provides an interface for users to interact with databases, allowing them to store, retrieve, and modify data. It handles tasks such as data organization, storage optimization, data security, and concurrency control. DBMS acts as an intermediary between users and the underlying database, providing efficient and reliable management of data.

3. What is RDBMS? How is it different from DBMS?

RDBMS stands for Relational Database Management System. It is a type of DBMS that specifically manages relational databases. RDBMS uses a tabular structure, with tables consisting of rows and columns, to organize and store data. It enforces relationships between tables through keys, ensuring data integrity.

The main difference between RDBMS and DBMS is that RDBMS is built on the foundation of the relational model, which defines relationships between tables, while DBMS is a broader term that encompasses various types of database management systems, including non-relational ones. RDBMS offers features such as data normalization, which minimizes redundancy and ensures efficient data storage. It also supports the use of Structured Query Language (SQL) for querying and manipulating data. RDBMS provides a reliable and standardized approach for managing structured data, making it widely used in applications and systems that require a structured and organized data storage model.

4. What is SQL?

SQL stands for Structured Query Language. It is a standard programming language used for managing and manipulating relational databases. SQL allows users to create, modify, and retrieve data from databases.

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