Question: From 1962 to 2011, how many coaches received both NBA and ABA awards?
SQL: SELECT COUNT(DISTINCT coachID) FROM awards_coaches WHERE year BETWEEN 1962 AND 2011 AND award = 'ABA Coach of the Year' AND coachID IN ( SELECT coachID FROM awards_coaches WHERE year BETWEEN 1962 AND 2011 AND award = 'NBA Coach of the Year' )