mySQL query to find duplicate row

Question

Exmaple:

[empid    date      bookid]
----------
1        5/6/2004   8

2        5/6/2004   8

1        5/7/2004   8

1        5/8/2004   6

3        5/8/2004         


        

Answer 1

SELECT empid
from table
group by empid
having Count(distinct bookid) > 1