Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: What is the total share (in percent) of all the channels owned by CCTV? | program : program_id , name , origin , launch , owner | channel : channel_id , name , owner , share_in_percent , rating_in_percent | broadcast : channel_id , program_id , time_of_day | broadcast_share : channel_id , program_id , date , share_in_percent | broadcast.program_id = program.program_id | broadcast.channel_id = channel.channel_id | broadcast_share.program_id = program.program_id | broadcast_share.channel_id = channel.channel_id | 

### Response:

select sum ( _ ) from _ where _ | select sum ( share_in_percent ) from channel where owner = 'CCTV'