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DADay 29 SQL 🔥 | Tech Company Interview Question
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🚫 COMMON DATA ISSUE (VERY IMPORTANT)
❌ Duplicate rows = wrong reports
❌ Double counting users/employees
❌ Poor data quality
✅ SQL helps you identify duplicates instantly
🎯 INTERVIEW TIP (SAVE THIS)
💡 Duplicates are found using GROUP BY + HAVING
💡 Multiple columns are checked together, not separately
💡 This question is asked in almost every tech interview
👉 Interviewers test your data thinking, not just syntax.
🧠 WHAT YOU LEARN IN THIS VIDEO (Beginner Friendly)
✅ 1️⃣ Identify duplicate values
SELECT name, department, position_title, COUNT(*)
FROM employees
GROUP BY name, department, position_title
HAVING COUNT(*) > 1;
📌 Groups identical records
📌 Counts how many times they appear
📌 Shows only repeated entries
📌 REAL-WORLD MEANING
If the same Name + Department + Role appears more than once,
👉 it’s treated as a duplicate record
🔥 WHY THIS MATTERS
• Prevents incorrect reports
• Improves data accuracy
• Essential for Data Analysts
SAVE this for revision 📌
SHARE with your SQL/interview buddy 🤝
Check Out Day 18: WHERE vs HAVING (must-watch)
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