🔥 SQL Interview Concept You MUST Know: COUNT()

COUNT() is one of the most commonly asked SQL functions in Data Analyst interviews.

It helps you count rows, records, or unique values, making it essential for reporting and data analysis.

📌 Key points:

🔹 Counts rows in a table
🔹 Can count non-NULL values using a column
🔹 COUNT(*) includes all rows
🔹 COUNT(DISTINCT column) counts unique values
🔹 Frequently used with GROUP BY

💡 Common interview use cases:

✅ Counting total customers
✅ Finding the number of orders per customer
✅ Counting unique products sold
✅ Measuring website visits
✅ Creating summary reports and dashboards

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