return me the total citations of papers in PVLDB before 2005 .
SELECT SUM ( t2.citation_num ) FROM publication AS t2 JOIN journal AS t1 ON t2.jid  =  t1.jid WHERE t1.name  =  "PVLDB" AND t2.year  <  2005;
SELECT SUM ( t2.citation_num ) FROM publication AS t2 JOIN journal AS t1 ON t2.jid  =  t1.jid WHERE t1.name  =  "PVLDB" AND t2.year  <  2005;
[{'SUM ( t2.citation_num )': None}]