return me the area of PVLDB .
SELECT t3.name FROM DOMAIN AS t3 JOIN domain_journal AS t1 ON t3.did  =  t1.did JOIN journal AS t2 ON t2.jid  =  t1.jid WHERE t2.name  =  "PVLDB";
SELECT t3.name FROM DOMAIN AS t3 JOIN domain_journal AS t1 ON t3.did  =  t1.did JOIN journal AS t2 ON t2.jid  =  t1.jid WHERE t2.name  =  "PVLDB";
[{'Nenhum': 'Nenhum resultado encontrado'}]