no. in
series no. in
season performer appearance air date
no . in series
no . in season
performer
appearance
air date
number
number
number parsed year month day
number number text text date
268 1 tom segura only 21 january 2011
how many different performers appeared during this season ?
WRB JJ JJ NNS VBD IN DT NN .
16
select count ( distinct c3 ) from w