Kesalahan Cast Mengonversi SQL

Satu-satunya hal yang muncul di mata adalah huruf besar AS dan alias kolom yang sama (secara default mysql tidak peka huruf besar-kecil). Bisakah Anda mencobanya seperti ini?

select campo1 as AGR_Number, campo2  as fattura, 
    campo76 as cod_periodo, campo78 as cod_scenario, 
    campo11 as origine, campo8 as Stazione,     
    campo13 as agent, campo30 as AAT_RATE, 
    sum (cast(campo30 as numeric (9,2))) as AAT_rate_sum 
from map_dati_trasformati 
where cod_mappatura = 'CARICA_NOL_CSV' 
AND CAMPO30 <> 0 
GROUP BY campo1, campo2, campo76, campo78, campo11 , 
        campo8, campo13, campo30