🔥 Most Asked SQL JOIN Patterns (Real Business Problems)

🔹 Find Customers Who Never Placed an Order → LEFT JOIN + NULL Check

🔹 Match Employees With Their Managers → SELF JOIN

🔹 Find Products Without Suppliers → LEFT JOIN

🔹 Generate Complete Sales Reports → INNER JOIN Across Multiple Tables

🔹 Compare Current & Previous Month Sales → SELF JOIN / CTE

🔹 Find Orders With Missing Customer Records → LEFT JOIN

🔹 Identify Common Customers Across Two Platforms → INNER JOIN

🔹 Find Products Purchased Together → SELF JOIN

🔹 Combine Sales From Multiple Sources → UNION ALL

🔹 Build Customer Purchase History → Multiple JOINs

❤️ React if you want more SQL interview patterns based on real company problems!