How Can I Efficiently Extract Duplicate Records with Full Details from MySQL?

Extracting Duplicate Records with Detailed Information from MySQL

To retrieve duplicate records from a MySQL database while preserving individual row details, you can use a modified query that combines a subquery to identify duplicate addresses:

SELECT firstname,
       lastname,
       address
FROM list
INNER JOIN (
    SELECT address
    FROM   list
    GROUP  BY address
    HAVING COUNT(id) > 1
) dup
ON list.address = dup.address;

By incorporating the subquery that identifies duplicate addresses into the main query, it is possible to display both the first name, last name, and address for each duplicate record. This approach eliminates the need for a secondary query to retrieve the details of duplicate records and provides a complete list in a single query.

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