mysql - How can I count the number of entities that don't have certain attributes grouped by a common attribute in an EAV(ish) schema? -


i'm trying count region of number of files don't contain "important" attributes given following dataset:

files ------------------------------------ id | file                  | region ------------------------------------ 1  | data.xml              | eastern 2  | 2011-01-01-report.xml | eastern 3  | regional report.xml   | western 4  | data.xml              | central 5  | 2010 summary.xml      | eastern  file_attributes -------------------------------------------- file_id   | attribute   | value | importance -------------------------------------------- 1         | patients    | 18    | 0 1         | deaths      | 17    | 1 2         | clients     | 5     | 0 3         | refunds     | 12    | 1 5         | deaths      | 4     | 1

i can count of number of files have important attributes this:

select   region   , count(f.id) file_count   , count(distinct if(fa.importance = 1, f.id)) files_w_important_attr   , count(distinct if(fa.importance = 0, f.id)) files_w_unimportant_attr files f   left join object_attributes fa     on f.id = fa.object_id group f.region

this yields following results:

region  | file_count | files_w_important_attr | files_w_unimportant_attr ------------------------------------------------------------------------ central | 1          | 0                      | 0 eastern | 3          | 2                      | 2 western | 1          | 1                      | 0

i'm having trouble figuring out how count of files without important attributes. note i'm not trying count of files have unimportant attributes 3rd column in above query yields. want following results:

region  | file_count | files_w_important_attr | files_w_no_important_attr ------------------------------------------------------------------------ central | 1          | 0                      | 1 eastern | 3          | 2                      | 1 western | 1          | 1                      | 0

how this?

sum( fa.importance null ) nulledfiles


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