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MySQL - delete all duplicated rows except one

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Created by:
Teilsa
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In this article, we would like to show you how to delete duplicated rows except one in MySQL.

Quick solution:

 

Practical example

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To show how to delete duplicated rows except one, we will use the following users table:

MySQL - example data used to delete duplicated rows except one
MySQL - example data used to delete duplicated rows except one

Note:

At the end of this article you can find database preparation SQL queries.

Example 1 - keep row with the lowest id value

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In this example, we will delete all the rows with duplicated name except one, with the lowest id value.

Query:

Result:

delete duplicated rows except one - result
delete duplicated rows except one - result

Example 2 - keep row with the highest id value

Edit

In this example, we will delete all the rows with duplicated name except one, with the highest id value.

Query:

Result:

delete duplicated rows except one - result
delete duplicated rows except one - result

Database preparation

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create_tables.sql file:

insert_data.sql file:

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MySQL - delete all duplicated rows except one
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