To remove duplicate rows in sql select statement

delete duplicate rows in sql using cte

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delete duplicate rows using cte

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Delete duplicate rows in sql using rank

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Problem

You want to delete duplicate rows from 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 want to delete duplicates from this table and leave only one record among the duplicates.

For example, Jack Russel from the Sales department has multiple records that are the same.

Solution

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

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

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

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

Discussion

First, we create a CTE called with a new column called , which stores all r

sql cte delete duplicates

sql delete duplicates using cte