find the program owners that have some programs in both morning and night time.
CREATE TABLE broadcast (program_id VARCHAR, Time_of_day VARCHAR); CREATE TABLE program (owner VARCHAR, program_id VARCHAR)
[SQL] SELECT t1.owner FROM program AS t1 JOIN broadcast AS t2 ON t1.program_id = t2.program_id WHERE t2.Time_of_day = "Morning" INTERSECT SELECT t1.owner FROM program AS t1 JOIN broadcast AS t2 ON t1.program_id = t2.program_id WHERE t2.Time_of_day = "Night" [/SQL]