MS ACCESS or Excel formula or code to result in desired output column -

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i have data has 1 many relation. below dummy data represent data. have id have multiple alt_ids. alt_ids have relation column called alt_spec_code. need or desire output column populate let's id_spec_code 1 of alt_spec_codes.

 id          alt_id          alt_spec_code          desired_outcome(id_spec_code)  123456      111111          pa                     pa  123456      222222          n/a                    pa  123456      121212          n/a                    pa  654321      333333          n/a                    st  654321      444444          st                     st  654321      434343          n/a                    st  987654      222222          n/a                    n/a  987654      121212          n/a                    n/a  987654      333333          n/a                    n/a  456789      111111          pa                     both  456789      444444          st                     both  456789      555555          n/a                    both

i thinking update statement update desired_outcome field max or maybe doa row_number type query rank alt_spec_code , update desired_outcome field first value finds. wasn't sure how handle last scenario might both.

select     y2.id,     y2.alt_id,     y2.alt_spec_code,     switch         (             countofalt_spec_code null, 'n/a',             sub2.countofalt_spec_code = 2, 'both',             sub2.countofalt_spec_code = 1, sub2.minofalt_spec_code         ) desired_outcome     yourtable y2     left join         (             select                 sub1.id,                 count(sub1.alt_spec_code) countofalt_spec_code,                 min(sub1.alt_spec_code) minofalt_spec_code                             (                     select distinct y1.id, y1.alt_spec_code                     yourtable y1                     y1.alt_spec_code<>'n/a'                 ) sub1             group sub1.id         ) sub2     on y2.id = sub2.id;

i didn't know how explain coherently. can figure out how works breaking out each subquery new access query, starting lowest level, select distinct ...

but strategy compute countofalt_spec_code , minofalt_spec_code each id. top-level switch expression can use information compute desired_outcome.


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