CREATE TABLE broadcast (channel_id DECIMAL, program_id DECIMAL, time_of_day TEXT)
CREATE TABLE program (program_id DECIMAL, name TEXT, origin TEXT, launch DECIMAL, owner TEXT)
CREATE TABLE channel (channel_id DECIMAL, name TEXT, owner TEXT, share_in_percent DECIMAL, rating_in_percent DECIMAL)
CREATE TABLE broadcast_share (channel_id DECIMAL, program_id DECIMAL, date TEXT, share_in_percent DECIMAL)

Find the total rating ratio for each channel owner.
SELECT SUM(rating_in_percent), owner FROM channel GROUP BY owner
SELECT SUM("rating_in_percent"), "owner" FROM "channel" GROUP BY "owner"