How to search for duplicate data in the database?

To search for duplicate data in a database, you can use the GROUP BY and HAVING clauses. Here is an example query:

Choose the name of the field, count the number of times it is repeated in the table, and group them by the field name only if the count is greater than 1.

Please replace the “field name” in the example with the actual field name, and replace the “table name” with the actual table name. This query will return duplicate data in the specified field and list the frequency of each duplicate data.