Table: tv_episodes_7
Columns: series
season
title
directed_by
written_by
original_air_date
u_s_viewers_millions

Question: Who wrote episode 23 in the season?
SQL: SELECT "written_by" FROM tv_episodes_7 WHERE "season" = '23'

Question: Who wrote the episode titled "An Old-fashioned Piano Party"?
SQL: SELECT "written_by" FROM tv_episodes_7 WHERE "title" = '"An Old-Fashioned Piano Party"'