MySQL: ALTER IGNORE TABLE gives “Integrity constraint violation”

Question

I\'m trying to remove duplicates from a MySQL table using ALTER IGNORE TABLE + an UNIQUE KEY. The MySQL documentation says:

IGNORE is a MySQL extensio

Answer 1

Or try set session old_alter_table=1 (Don't forget to set it back!)

See: http://mysqlolyk.wordpress.com/2012/02/18/alter-ignore-table-add-index-always-give-errors/