Table: tv_episode_data_27
Columns: series
season
title
director
writer_s
airdate

Question: What episode  number of the series aired on February 26, 1968?
SQL: SELECT "series" FROM tv_episode_data_27 WHERE "airdate" = 'February 26, 1968'

Question: How many people directed the episode that aired on February 5, 1968?
SQL: SELECT COUNT("director") FROM tv_episode_data_27 WHERE "airdate" = 'February 5, 1968'

Question: Who directed the episode that aired on September 25, 1967?
SQL: SELECT "director" FROM tv_episode_data_27 WHERE "airdate" = 'September 25, 1967'

Question: Who directed the episode that aired on February 19, 1968?
SQL: SELECT "director" FROM tv_episode_data_27 WHERE "airdate" = 'February 19, 1968'

Question: How many episode titles aired on September 25, 1967?
SQL: SELECT COUNT("title") FROM tv_episode_data_27 WHERE "airdate" = 'September 25, 1967'