$db->do($_) for
    'PRAGMA FOREIGN_KEYS = ON',
    'CREATE TABLE user_tbl   (id INTEGER PRIMARY KEY, name  VARCHAR(5))',
    'CREATE TABLE topic_tbl  (id INTEGER PRIMARY KEY, topic VARCHAR(6))',
    join ' ', 'CREATE TABLE detail_tbl (id INTEGER PRIMARY KEY, detail VARCHAR(7),',
              'name_id INTEGER, topic_id INTEGER,',
              'FOREIGN KEY (name_id) REFERENCES user_tbl(id),',
              'FOREIGN KEY (topic_id) REFERENCES topic_tbl(id))';