return me the number of the keywords of " Making database systems usable " .
SELECT COUNT ( DISTINCT t1.keyword ) FROM publication_keyword AS t3 JOIN keyword AS t1 ON t3.kid  =  t1.kid JOIN publication AS t2 ON t2.pid  =  t3.pid WHERE t2.title  =  "Making database systems usable";
SELECT COUNT ( DISTINCT t1.keyword ) FROM publication_keyword AS t3 JOIN keyword AS t1 ON t3.kid  =  t1.kid JOIN publication AS t2 ON t2.pid  =  t3.pid WHERE t2.title  =  "Making database systems usable";
[{'COUNT ( DISTINCT t1.keyword )': 0}]