year competition venue position notes
year
competition
venue
position
notes
number
address
number
number
number text address rank unitnum
1991 world race walking cup san jose, united states 12th 50 km
how many world championships did imamura participate in ?
WRB JJ NN NNS VBD-AUX NNP VB IN .
7
Keyword Keyword Keyword Keyword Keyword Keyword Keyword Keyword Column Keyword Literal.String
select count ( * ) from w where c2 = 'world championships'
Keyword Keyword Literal Literal None None None None None
['agg', 'agg_count'] ['agg', 'agg_count']