Deleting duplicates from a large table

Question

I have quite a large table with 19 000 000 records, and I have problem with duplicate rows. There\'s a lot of similar questions even here in SO, but none of them seems to gi

Answer 1

This query works perfectly for every case : tested for Engine : MyIsam for 2 million rows.

ALTER IGNORE TABLE table_name ADD UNIQUE (location_id, datetime)