Question

I dont know if this is possible with one query, but here goes:

I have a column that is a set datatype. I want to select a count of each possible value of the set. So I have:

row 1 set column value: ‘opt 1′,’opt 2’

row 2 set column value: ‘opt 1’, ‘opt 3’

row 3 set column value: ‘opt 3′,’opt 4′,’opt 2’

I need a query that will produce a structure similar to (doesnt have to be exactly this, just a count for each possible value of the set):

Array(
    [0] => Array(
        'value'=>'opt 1',
        'count'=> 2
    ),
    [1] => Array(
        'value'=>'opt 2',
        'count' => 2
    ),
    [2] => Array(
        'value'=>'opt 3',
        'count' => 2
    ),
    [3] => Array(
        'value'=>'opt 4',
        'count' => 1
    )
)

Answer 1

since your SET column is a bitmap, you could setup a query like this:

SELECT count(NULLIF(columnName & 1,0)) as Count1stVal,
       count(NULLIF(columnName & 2,0)) as Count2ndVal,
       count(NULLIF(columnName & 4,0)) as Count3rdVal,
       count(NULLIF(columnName & 8,0)) as Count4thVal, 

…