Data Cleaning

SQL Query to Remove Duplicate Records While Keeping Latest Entry

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🧹 SQL Query to Remove Duplicate Records While Keeping the Latest Entry Duplicate data is one of the most common problems in database management. In this tutorial, you’ll learn how to remove duplicate records while keeping only the latest entry — based on a timestamp or unique ID. This technique works in MySQL, SQL Server, … Read more

SQL Query to Find Duplicate Records with Different Values

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🧠 SQL Query to Find Duplicate Records with Different Values (Real-World Example) Data duplication is one of the most common challenges in database management. Often, you’ll encounter duplicate records with mismatched details — such as the same employee ID appearing with different email addresses or contact numbers. These inconsistencies can cause serious reporting errors in … Read more