flight date payload nickname payload orbit result
flight
date
payload nickname
payload
orbit
result
first second
number parsed year month day
first second
text(text) date text text(text) text text
tf1 (test flight) february 4, 1994 ryusei orex (orbital re-entry experiment) leo success
how many years passed between flight tf2 and flight f8 ?
WRB JJ NNS VBN IN NN NN CC NN NN .
5
select abs ( ( select c2_year from w where c1 = 'tf2' ) - ( select c2_year from w where c1 = 'f8' ) )