Ho provato a realizzare la seguente query:

codice:
select detailDestinationName as 'Nome Coda', count(*) as 'Totale Chiamate ricevute',
count(case when status = 'SERVED' then uniqueId else null end) as 'Chiamate Servite',
(count(case when status = 'SERVED' then uniqueId else null end)/count(*)*100) as '% chiamate servite',
ifnull((count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end)/(count(*)-count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end))*100),0) as "Totale Abbandoni",
count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end) as 'Chiamate non Servite Superiori a 30 secondi',
ifnull((count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end)/count(case when status = 'NOTSERVED' then uniqueId else null end )*100),0) as '% chiamate non servite superiore a 30 secondi', 
count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end) as 'Chiamate non Servite Inferiori a 30 secondi', 
ifnull((count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end)/count(case when status = 'NOTSERVED' then uniqueId else null end )*100),0) as '% chiamate non servite inferiore a 30 secondi'
from chiamate_report_new
group by detailDestinationId
UNION
 select 'TOTALE' as 'Nome Coda',
  sum(count(*)) as 'Totale Chiamate ricevute',
  sum(count(case when status = 'SERVED' then uniqueId else null end)) as 'Chiamate Servite',
  sum((count(case when status = 'SERVED' then uniqueId else null end)/count(*)*100)) as '% chiamate servite',
  sum(ifnull((count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end)/(count(*)-count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end))*100),0)) as "Totale Abbandoni",
  sum(count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end)) as 'Chiamate non Servite Superiori a 30 secondi',
  sum(ifnull((count(case when status = 'NOTSERVED' and waitingTime >= 30 then uniqueId else null end)/count(case when status = 'NOTSERVED' then uniqueId else null end )*100),0)) as '% chiamate non servite superiore a 30 secondi', 
  sum(count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end)) as 'Chiamate non Servite Inferiori a 30 secondi',
  sum(ifnull((count(case when status = 'NOTSERVED' and waitingTime < 30 then uniqueId else null end)/count(case when status = 'NOTSERVED' then uniqueId else null end )*100),0)) as '% chiamate non servite inferiore a 30 secondi'
  from chiamate_report_new;
ma ottengo l'errore:Error Code: 1111. Invalid use of group function

Cosa ho sbagliato?