SQL Overview and Select Query

common scenarios where people store data:

Text Files (e.g., CSV, TXT): Simple, lightweight, but limited.
Excel Files: Great for small datasets but struggles with large-scale data or collaborative use.
Databases: Designed for large-scale data, optimized querying, and multiple users.

With text or Excel, filtering out duplicate names/emails is manual and time-consuming.
Databases allow easy querying using SQL, such as identifying unique customers.

the benefits of using databases over text or Excel files for structured, scalable, and secure data storage.