✅ SQL Skills Every Beginner Should Learn 📊💻

1️⃣ Understanding the Basics
⦁ What is a database and table
⦁ Rows, columns, primary keys, foreign keys
⦁ Relational database concepts

2️⃣ Core SQL Queries
⦁ SELECT, FROM, WHERE – Get filtered data
⦁ ORDER BY, LIMIT – Sort and control output
⦁ DISTINCT, BETWEEN, IN, LIKE – Filter smarter

3️⃣ Joins (Combine Tables)
⦁ INNER JOIN – Matching records in both tables
⦁ LEFT JOIN, RIGHT JOIN – Include unmatched from one side
⦁ FULL OUTER JOIN – All records, matched or not

4️⃣ Aggregations
⦁ COUNT(), SUM(), AVG(), MIN(), MAX()
⦁ GROUP BY to summarize data
⦁ HAVING to filter aggregated results

5️⃣ Subqueries & CTEs
⦁ Subquery inside WHERE or SELECT
⦁ WITH clause for clean and reusable code

6️⃣ Window Functions
⦁ ROW_NUMBER(), RANK(), DENSE_RANK()
⦁ PARTITION BY, ORDER BY inside OVER()

7️⃣ Data Cleaning & Logic
⦁ Handle NULL values
⦁ Use CASE WHEN for conditional columns
⦁ Remove duplicates using DISTINCT or ROW_NUMBER()

8️⃣ Practice & Projects
⦁ Sales reports, user activity, inventory tracking
⦁ Work on public datasets
⦁ Solve SQL questions on LeetCode or HackerRank

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