SQL

Introduction

SQL (Structured Query Language) is used to manage and query relational databases. It allows insertion, updating, deletion, and retrieval of data.

History

SQL was developed at IBM in the 1970s, originally called SEQUEL. It later became the industry standard for relational databases.

Key Features

• Manage relational databases
• Retrieve and manipulate data
• Supports complex queries
• Standardized across platforms

Applications

• Banking and financial systems
• E-commerce platforms
• Data analysis and reporting
• Business intelligence systems

Advantages & Limitations

• Advantages: Universal standard, easy to learn, powerful queries
• Limitations: Not suitable for non-relational (NoSQL) databases, performance issues with very large datasets

Hello World Example

CREATE TABLE Students (
    ID INT PRIMARY KEY,
    Name VARCHAR(50),
    Age INT
);

INSERT INTO Students VALUES (1, 'John', 20);

SELECT * FROM Students;
      

Output:

ID | Name | Age
1  | John | 20
      

SQL Editor

Edit to Execute

Resources

• W3Schools SQL
• SQL Tutorial
• GeeksforGeeks SQL

Contact

Email: info@sql.com