MySQL pivottabel

Du kunne prøve (utestet) noget lignende

select form_id, 
max(case data_label when 'lastName' then data_value else null end) as lastname, 
max(case data_label when 'firstName' then data_value else null end) as firstname,
max(case data_label when 'phone' then data_value else null end) as phone
from mytable 
group by form_id