Question

Here is my current query (confidential data replaced and where clauses removed for simplicity):

select a.id, group_concat(v.value) from asset a, values v where a.id=v.id group by a.case_id;

The current results appear as:

a.id   v.value
123   a,b
234   a
456   a,b,c
789   d,e
237   a

What I want it to do is group by and count the results of the group_concat, so it should look like:

v.value    count
a,b           1
a              2
a,b,c        1
d,e           1

I have tried unsuccessfully to group on the field name I give to the group_concat, it keeps on saying ‘unable to group by ‘name’

I have to do this directly in the query not in the code. Any suggestions?

Answer 1

SELECT gc_values
     , COUNT(*)
  FROM 
     ( SELECT a.id
            , GROUP_CONCAT(v.value) gc_values
         FROM asset a
         JOIN `values` v 
           ON v.id = a.id
        GROUP
           BY a.id
     ) x
 GROUP
    BY gc_values;