Find duplicate strings in database

I need to find all rows in my table where the strings of a specific field are duplicates in two or more places.

Can that be don开发者_如何学JAVAe in a MySQL statment?

EDIT

I need to get every row not just a count of how many duplicates there are. I want to be able to edit the fields.

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Yes, try something like this:

SELECT *
FROM `YourTable`
WHERE `YourColumn` IN (
    SELECT `YourColumn`
    FROM `YourTable`
    GROUP BY `YourColumn`
    HAVING COUNT(*) > 1
)

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Yes, using GROUP BY and HAVING.

SELECT mycolumn, count(*) FROM mytable
group by mycolumn
having count(*) > 1