year competition venue position notes
year
competition
venue
position
notes
number
address
first second first_number
first second first_number second_result
number text address rank(text) unitnum(score)
1996 world junior championships sydney, australia 15th (q) 7.91 m (w)
what is the number of competitions that have been competed in ?
WP VBD-AUX DT NN IN NNS WDT VBD-AUX VBD-AUX VBN IN .
7
select count ( c2 ) from w