How to Find Duplicate Records in SQL | SQL Interview Question Explained
How do you find duplicate records in a SQL table? 🤔
In this video, we solve one of the most common SQL interview questions: How to find duplicate records in a table?
You’ll learn 3 practical approaches to identify duplicates using SQL:
✅ Find duplicate values using GROUP BY and HAVING
✅ Retrieve the complete duplicate records
✅ Find duplicate rows using ROW_NUMBER()
✅ Understand PARTITION BY with ROW_NUMBER()
✅ Identify which records to keep and which are duplicates
✅ Understand how the same concept can be used when removing duplicates
✅ Learn common interview follow-up questions
💡 SQL Concepts Covered
GROUP BY
HAVING
COUNT()
Subqueries
ROW_NUMBER()
PARTITION BY
Analytical / Window Functions
DELETE
Duplicate Data Handling
This video is useful for SQL beginners, Data Analysts, Data Engineers, BI Developers, Oracle SQL developers, and anyone preparing for SQL interviews.
If you're preparing for a SQL interview, make sure you practice this problem because duplicate-record questions are extremely common.
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