MySQL select records for duplicates using multiple columns

Question

I would like the select records from a table, or insert them into a new blank table where multiple of the columns is the same as another record in the database. The problem

Answer 1

why don't you try using union or creating temporary table. but personally, i do recommend using union than that of creating temporary table cause it would take you a longer time doing that. try doing this:

  select field1, field2 from(
   select '' as field2, field1, count(field1) as cnt FROM list GROUP BY field2 HAVING cnt > 1
    union
    select ''as field1, field2, cound(field2) as cnt from list group by field1 having cnt > 1
  )

hope this make sense.:)