Table: kohaku_results
Columns: k_haku
date
red_team_host
white_team_host
mediator
winning_team

Question: In what number kōhaku was the red team host Peggy Hayama? 
SQL: SELECT "k_haku" FROM kohaku_results WHERE "red_team_host" = 'Peggy Hayama'

Question: Who was the mediator in kōhaku number 53?
SQL: SELECT "mediator" FROM kohaku_results WHERE "k_haku" = 53

Question: On what date was Keiichi Ubukata the mediator and Mitsuko Mori the red team host?
SQL: SELECT "date" FROM kohaku_results WHERE "mediator" = 'Keiichi Ubukata' AND "red_team_host" = 'Mitsuko Mori'