🚫 Avoid the Learning Trap:
Watching 100+ tutorials but no hands-on practice.
✅ Reality:
75% of real SQL work boils down to these essentials:
1️⃣ SELECT, FROM, WHERE
⦁ Pick columns, tables, and filter rows
SELECT name, age FROM customers WHERE age > 30;
2️⃣ JOINs
⦁ Combine related tables (INNER JOIN, LEFT JOIN)
SELECT o.id, c.name FROM orders o JOIN customers c ON o.customer_id = c.id;
3️⃣ GROUP BY
⦁ Aggregate data by groups
SELECT country, COUNT(*) FROM users GROUP BY country;
4️⃣ ORDER BY
⦁ Sort results ascending or descending
SELECT name, score FROM students ORDER BY score DESC;
5️⃣ Aggregation Functions
⦁ COUNT(), SUM(), AVG(), MIN(), MAX()
SELECT AVG(salary) FROM employees;
6️⃣ ROW_NUMBER()
⦁ Rank rows within partitions
SELECT name,
ROW_NUMBER() OVER (PARTITION BY department ORDER BY salary DESC) AS rank
FROM employees;
💡 Final Tip:
Master these basics well, practice hands-on, and build up confidence!
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