Question: What is the Adapted by when there is a Yes for exists is Yes, for episode 101?
SQL: SELECT "Adapted by" FROM "2-15739098-1" WHERE "Exists?" = 'Yes' AND "Episode" = 101.0;

Question: What is the Director for the episode titled “Some Lapse of Time”?
SQL: SELECT "Director" FROM "2-15739098-1" WHERE "Title" = '“Some Lapse of Time”';

Question: What is the Airdate for the episode titled “Thirteen to Centaurus” Adapted by Stanley Miller?
SQL: SELECT "Airdate" FROM "2-15739098-1" WHERE "Adapted by" = 'Stanley Miller' AND "Title" = '“Thirteen to Centaurus”';

Question: What is the Exists when Ray Jenkins is the director?
SQL: SELECT "Exists?" FROM "2-15739098-1" WHERE "Director" = 'Ray Jenkins';

Question: What shows for Exists when the airdate was 20 December 1965?
SQL: SELECT "Exists?" FROM "2-15739098-1" WHERE "Airdate" = '20 December 1965';