Find duplicates in the same table in MySQL

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.

SELECT id,artist,COUNT(*) FROM myTable
GROUP BY artist, release_id HAVING COUNT(*) > 1

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;

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