Delete duplicated records from a table without pk or id or unique columns in mysql

Question

I need to delete all the duplicated records from one of my tables the problem is that there isn\'t any id or unique or key column so I can\'t make something like this:

Answer 1

Adding a unique index (with all the columns of the table) with ALTER IGNORE will get rid of the duplicates:

ALTER IGNORE TABLE table_name
  ADD UNIQUE INDEX all_columns_uq
    (phone, address, name, cellphone) ;

Tested in SQL-Fiddle.

Note: In version 5.5 (due to a bug in the implementation of fast index creation), the above will work only if you provide this setting before the ALTER:

SET SESSION old_alter_table=1 ;