rank heat athlete nationality time notes
rank
heat
athlete
nationality
time
notes
number
number
number
list length
number number text text number <c,text>
1 1 natalya ivanova russia 23.11 q
what is the difference between mexico and brazil time
WP VBD-AUX DT NN IN NNP CC NNP NNP
.22
select abs ( ( select c5_number from w where c4 = 'mexico' ) - ( select c5_number from w where c4 = 'brazil' ) )