📚 Lecture 1: Introduction to SQL and Relational Databases

🎯 Learning Outcomes

By the end of this lecture, you will be able to:

• Explain what SQL is and what it stands for.
• Define data, database, relational database, and RDBMS.
• Identify the five basic SQL commands.

🧠 Key Concepts

🔹 What is SQL?

• SQL (Structured Query Language) is a language used to communicate with relational databases.
• Pronounced as “sequel”.
• Used to query (retrieve), insert, update, and delete data.

🔹 What is Data?

• Data = collection of facts — words, numbers, or even images.
• Considered one of the most valuable assets for any organization.
• Example: A bank stores customer data like name, address, account number, etc.
• Data must be stored securely and accessed efficiently.

🔹 What is a Database?

• A database is a repository (storage) of data.