MySQL: Count unique pairs of values in rows

Question

I\'m stuck with a problem I don\'t know how to solve. Here\'s what my table \'myTable\' look like:

+----------+-------------+------+-----+---------+---------         


        

Answer 1

As you need to count distinct name you need to use distinct keyword.

Try this query

select 
   one,  
   count(distinct two) as cnt 
from 
   tbl 
group by 
   one

SQL FIDDLE

|   ONE | CNT |
---------------
|   cat |   2 |
|   dog |   3 |
| mouse |   1 |