Find duplicates in the same table in MySQL

Question

I have a table with two columns - artist, release_id

What query can I run to show duplicate records?

e.g. my table is

ArtistX : 45677
ArtistY         


        

Answer 1

you can use this query for the same result. it works for me

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

Answer 2

You can use a grouping across the columns of interest to work out if there are duplicates.

SELECT
    artist, release_id, count(*) no_of_records
FROM table
GROUP BY artist, release_id
HAVING count(*) > 1;

Answer 3

SELECT artist, count(*) 
FROM tableName 
GROUP BY artist 
HAVING count(*) > 1;

Answer 4

SELECT id,artist,COUNT(id) as found FROM table GROUP by id HAVING found > 1

Answer 5

SELECT artist, release_id, count(*) no_of_records, group_concat(id) FROM table GROUP BY artist, release_id HAVING count(*) > 1;

also adding group_concat(id) gets you all ids of the duplicates.

Answer 6

Try this:

SELECT A.ARTIST,A.RELEASE_ID FROM ARTISTS A
WHERE EXISTS(
SELECT 'X' FROM ARTISTS B
WHERE B.ARTIST = A.ARTIST AND B.RELEASE_ID = A.RELEASE_ID
GROUP BY B.ARTIST,B.RELEASE_ID
HAVING COUNT(B.ARTIST)>1)
ORDER BY A.ARTIST;