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Today, let's start with the first topic of SQL roadmap:

✅ Introduction to SQL

SQL is the language you use to ask questions from data stored in databases. Companies store all important data in databases. Sales. Users. Payments. Inventory. When a manager asks a question, SQL pulls the answer.

What a database is
A database is an organized storage system for data. Think of it as a digital cupboard where each drawer holds related data. Each drawer is called a table.

What a table is
A table looks like an Excel sheet. It has rows and columns. Each table stores one type of data.

Example table: customers
- Columns
- customer_id
- name
- email
- city
- signup_date
- Rows
- Each row represents one customer
- One row equals one real-world record

How rows and columns work together
- Columns define what kind of data you store
- Rows hold actual values
- All rows follow the same column structure

Example row
- customer_id: 101
- name: Rahul
- email: rahul@gmail.com
- city: Pune
- signup_date: 2024-03-10

Why structure matters
- Clean structure makes data reliable
- Easy to filter, count, and analyze
- Required for accurate reporting

How SQL interacts with tables
- SQL reads data from tables
- SQL filters rows
- SQL selects columns
- SQL summarizes results

Simple SQL example
You ask the database to show names and cities of customers.

SELECT name, city FROM customers;

What happens behind the scenes
- Database scans the customers table
- Picks name and city columns
- Returns matching rows

Where you will use this daily
- Pull user lists
- Check sales numbers
- Validate data issues

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