party leader from to
party
leader
from
to
number parsed year month
number parsed year month
text text date date
scottish national party gordon wallace may 1974 may 1978
how many group leaders were from the conservative party ?
WRB JJ NN NNS VBD-AUX IN DT JJ NN .
2
select count ( c2 ) from w where c1 = 'conservative'