return me the number of papers on PVLDB after 2000 .
SELECT COUNT ( DISTINCT t2.title ) FROM publication AS t2 JOIN journal AS t1 ON t2.jid  =  t1.jid WHERE t1.name  =  "PVLDB" AND t2.year  >  2000;
SELECT COUNT ( DISTINCT t2.title ) FROM publication AS t2 JOIN journal AS t1 ON t2.jid  =  t1.jid WHERE t1.name  =  "PVLDB" AND t2.year  >  2000;
[{'COUNT ( DISTINCT t2.title )': 0}]