Question: What was the original air date of Stargate SG-1 written by Peter DeLuise?
SQL: SELECT "Original air date" FROM "1-15431959-1" WHERE "Written by" = 'Peter DeLuise';

Question: How many seasons did Peter DeLuise direct Stargate SG-1?
SQL: SELECT MAX("No. in season") FROM "1-15431959-1" WHERE "Directed by" = 'Peter DeLuise';

Question: Which number episode of season 6 was the title "Sight Unseen"?
SQL: SELECT MIN("No. in season") FROM "1-15431959-1" WHERE "Title" = '"Sight Unseen"';