year title role network notes
year
title
role
network
notes
number
list length
number text <f,text> text text
2000 youth y2k
青春@y2k cheng shasha tvb eason chan's music video
how many appearances have no role listed ?
WRB JJ NNS VBD-AUX DT NN VBN .
2
select count ( * ) from w where c3 is null