How to find duplicate rows based on multiple field

Question

This question already has answers here:

Closed 7 years ago.

Possible Duplicate:
Mysql Duplicate Rows ( Duplicate detected using 2 columns )

In a MySQL database I have many rows. For example:

id | title   | time  | domain
32   title1    12:30   domain1.com
33   title1    12:30   domain2.com
34   title2    14:20   domain1.com
35   title3    14:30   domain2.com
36   title1    12:30   domain55.com

How am I able to select rows from a database based on only title and time? Duplicate domains or ID's are not of concern, only the other two fields.

I want to be able to retrieve rows 32, 33 and 36 because they have identical titles and identical times.

I don't want to have to put in a title or time, I want the query to return all fields where there's a "duplicate" match found on these two fields whether that be only two or 50. That way I can go through and edit or delete some of the duplicates.

Answer 1

Here is what you want

SELECT title, time  
  FROM table
GROUP BY title, time
  HAVING count(*) > 1

Answer 2

select distinct id, title, time
  from table t1
 where exists (select * 
                 from table t2 
                where t2.id <> t1.id
                  and t2.title = t1.title
                  and t2.time = t1.time
               )