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

I think you can use this query to delete the duplicate records from the table

ALTER IGNORE TABLE table_name ADD UNIQUE (location_id, datetime)

Before doing this, just test with some sample data first..and then Try this....

Note: On version 5.5, it works on MyISAM but not InnoDB.