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MySQL - count duplicated rows

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Created by:
Marcino
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In this article, we would like to show you how to count duplicated rows in MySQL.

Quick solution:

 

Practical example

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To show how to count duplicated rows, we will use the following users table:

MySQL - example data used to count duplicated rows
MySQL - example data used to count duplicated rows

Note:

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

Example

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In this example, we will count duplicated user names.

Query:

Result:

MySQL - count duplicated rows - result
MySQL - count duplicated rows - result

Database preparation

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create_tables.sql file:

insert_data.sql file:

Alternative titles

  1. MySQL - display numbers of duplicated rows
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