Table: tv_episode_data_7
Columns: series
season
title
directed_by
written_by
original_air_date

Question: Who was "The Magic Necklace" written by?
SQL: SELECT "written_by" FROM tv_episode_data_7 WHERE "title" = '"The Magic Necklace"'

Question: Which Season originally aired on September 17, 1955
SQL: SELECT "season" FROM tv_episode_data_7 WHERE "original_air_date" = 'September 17, 1955'

Question: What is the lowest number of series?
SQL: SELECT MIN("series") FROM tv_episode_data_7

Question: When did season 9 originally air?
SQL: SELECT "original_air_date" FROM tv_episode_data_7 WHERE "season" = 9

Question: Who directed the episode that was written by Jackson Gillis and Originally aired on May 21, 1955?
SQL: SELECT "directed_by" FROM tv_episode_data_7 WHERE "written_by" = 'Jackson Gillis' AND "original_air_date" = 'May 21, 1955'