laravel - How to select duplicate rows and group by two columns -


i have following table:

id|user_id|group_id|subject |book_id  1| 2     |3       |history |1  2| 4     |3       |history |1  3| 5     |3       |art     |2  4| 2     |3       |art     |2  5| 1     |4       |sport   |5

i list rows group 3(id) have duplicate rows same subject_id , book_id. subject , book_id determine 2 or more rows duplicate.

i distinct results this:

|subject |book_id| |history |1      | |art     |2      |

using either query builder or eloquent

a sql query desired result may 

select subject, book_id   table1  group_id = 3  group subject, book_id having count(*) > 1

here sqlfiddle demo

now same using laravel query builder

$duplicates = db::table('table1')     ->select('subject', 'book_id')     ->where('group_id', 3)     ->groupby('subject', 'book_id')     ->havingraw('count(*) > 1')     ->get();

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