Database: academic
Question: return me the number of the papers of " H. V. Jagadish " containing keyword " User Study " .
SQL:
SELECT COUNT ( DISTINCT t5.title ) FROM publication_keyword AS t3 JOIN keyword AS t1 ON t3.kid  =  t1.kid JOIN publication AS t5 ON t5.pid  =  t3.pid JOIN writes AS t4 ON t4.pid  =  t5.pid JOIN author AS t2 ON t4.aid  =  t2.aid WHERE t2.name  =  "H. V. Jagadish" AND t1.keyword  =  "User Study";