eq { count { filter_greater_eq { filter_greater_eq { all_rows ; max height ( ft ) ; 20000 } ; m / v ft / s ; 2200 } } ; 3 } = true
select the rows whose max height  ft  record is greater than or equal to 20000 . among these rows , select the rows whose m  v ft  s record is greater than or equal to 2200 . the number of such rows is 3 .