🔥 SQL Interview Concept You MUST Know: LEAD()

LEAD() is a powerful SQL window function that lets you access data from the next row without using a self join.
It's widely used in analytics to compare current values with future values in a dataset.

📌 Key points:

🔹 Retrieves values from the next row
🔹 Uses the OVER() clause
🔹 Eliminates the need for self joins
🔹 Ideal for sequential and time-series analysis
🔹 Common in advanced SQL interview questions

💡 Common interview use cases:

✅ Comparing current and next month's sales
✅ Calculating future growth trends
✅ Identifying changes between consecutive records
✅ Tracking customer activity over time
✅ Building analytical business reports

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