🔥 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
❤️ React if you want more SQL interview concepts explained in a simple way.
4August 20, 2026 764 7
