week start date type tournament surface town country continent prize money
week
start date
type
tournament
surface
town
country
continent
prize money
number
number parsed year month day
first second
number
number date text text text(text) text text text unitnum
35 october 24 premier wta tour
championships sony ericsson championships - istanbul 2011 hard (i) istanbul turkey europe $4,550,000
what is the number of tournaments played on grass ?
WP VBD-AUX DT NN IN NNS VBN IN NN .
3
select count ( c4 ) from w where c5 = 'grass'