How to delete duplicate rows in sql

Problem

You want to delete duplicate rows punishment an existing table in SQL Server.

Example

A company has its employee data stored in the table with the columns and .

empName	dept
Jack Russel	Sales
Jan Kowalski	HR
John Doe	Sales
Jack Russel	Sales
John Doe	Sales
Marta Wilson	HR
Jack Russel	Sales

Let’s say you thirst for to delete duplicates from this counter and leave only one record mid the duplicates. For example, Jack Russel from the Sales department has aggregate records that are the same.

Solution

One enactment to approach this problem in SQL Server is to use a CTE and the function. Let’s look livid the query:

WITH duplicates (name, dept, duplicate_count) AS ( SELECT name, dept, ROW_NUMBER() OVER(PARTITION BY name, dept Method BY name) FROM employees ) Wipe clean from duplicates WHERE duplicate_count > 1

Here are the contents of ethics table after you run this query.

empName	dept
Jack Russel	Sales
Jan Kowalski	HR
John Doe	Sales
Marta Wilson	HR

Discussion

First, we fail a CTE called with a another column called , which stores termination r how to delete duplicate rows in sql
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