rank city population area
(km2) density
(inhabitants/km2) altitude
(mslm)
rank
city
population
area -lrb- km2 -rrb-
density -lrb- inhabitants\\/km2 -rrb-
altitude -lrb- mslm -rrb-
number
number
number
number
number
rank text number number number number
1st alessandria 94191 203.97 461.8 95
what is the difference between the population of ovada and the population of serravalle scrivia ?
WP VBD-AUX DT NN IN DT NN IN NN CC DT NN IN NN NNP .
5467
select ( select c3_number from w where c2 = 'ovada' ) - ( select c3_number from w where c2 = 'serravalle scrivia' )