Delete Duplicate Rows In SQL Server

Delete Duplicate Rows in SQL Server

By Amr Saafan Technical, Database, Engineering delete duplicate rows in sql, delete record sql, delete sql, duplicate data, SQL, sql remove duplicates, SQL Server, using sql

I was working on a legacy Database with tables that has a lot of records, more than like 1M records.

I noticed some duplicate rows there and I had to do something about this.

After some research I came up with the following code that would delete duplicated rows in a table.

DELETE FROM Table1 WHERE ID NOT IN 
(
  SELECT MAX(ID)
  FROM Table1
  GROUP BY DupCol1, DupCol2, DupCol3
)

Author

Amr Saafan

Founder | CEO | CTO | Project Manager | Product Owner

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Delete Duplicate Rows in SQL Server

Delete Duplicate Rows in SQL Server

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