Question

I’m looking for a tool that allows me to easily manage duplicate entries in the MySQL database.

In a sense, I don’t want to make my columns ‘UNIQUE’, but I want to review the records that happen to have exactly the same value in a column.

It would be nice if I could craft such an SQL query that shows only such records using the usual interface.

Answer 1

To get duplicates, just use a self-join on the table :

select t1.id, t2.id, t1.value
from table t1
inner join table t2 on t1.value=t2.value
where t1.id < t2.id

The t1.id < t2.id will make sure every duplicate will only appear once.