How many clubs does the student named 'Eric TAI' belong to ?
SELECT count ( DISTINCT t1.clubname )  FROM club AS t1 JOIN member_of_club AS t2 ON t1.clubid   =   t2.clubid JOIN student AS t3 ON t2.stuid   =   t3.stuid WHERE t3.fname   =   "Eric" AND t3.lname   =   "Tai"
number of clubs a student belongs to is calculated by COUNT(DISTINCT clubname); student named 'Eric TAI' refers to filtering where fname = 'Eric' AND lname = 'Tai'; joining tables to relate clubs to students.