🔥 SQL Interview Concept You MUST Know: GROUP BY
GROUP BY is one of the most frequently used SQL concepts for analyzing and summarizing data.
It allows you to combine rows with similar values and perform calculations using aggregate functions like COUNT(), SUM(), AVG(), MIN(), and MAX().
📌 Key points:
🔹 Groups similar records together
🔹 Works with aggregate functions
🔹 Helps summarize large datasets
🔹 Used for creating reports and insights
🔹 Commonly combined with HAVING for filtering groups
💡 Common interview use cases:
✅ Finding total sales by category
✅ Calculating average salary by department
✅ Counting customers from different locations
✅ Identifying top-performing products
✅ Generating business reports and dashboards
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4August 17, 2026 1.1K 6
