instruction: return me the number of papers by ' H. V. Jagadish ' on PVLDB after 2000 .
response: SELECT COUNT(DISTINCT (publication.title)) FROM author, journal, publication, writes WHERE author.name = 'H. V. Jagadish' AND journal.name = 'PVLDB' AND publication.jid = journal.jid AND publication.year > 2000 AND writes.aid = author.aid AND writes.pid = publication.pid