SELECT sum(Share_in_percent) FROM channel WHERE OWNER  =  'CCTV'
What is the total share (in percent) of all the channels owned by CCTV?
SELECT sum ( Share_in_percent ) FROM channel WHERE OWNER = 'CCTV '
select sum ( share_in_percent ) from channel where owner = value
What is the total share ( in percent ) of all the channels owned by CCTV ?