year competition venue position event notes
year
competition
venue
position
event
notes
number
address
number
number hour min sec
number text address rank text time
1994 european championships helsinki, finland 48th marathon 2:22:49
what was the number of summer olympics that were competed in ?
WP VBD-AUX DT NN IN NN NNS WDT VBD-AUX VBN IN .
4
select count ( * ) from w where c2 = 'summer olympics'