Table: episodes_42
Columns: no
col
title
directed_by
written_by
u_s_air_date
production_code
u_s_viewers_million

Question: How many u.s. viewers  (million) have 6 as the #?
SQL: SELECT "u_s_viewers_million" FROM episodes_42 WHERE "col" = 6

Question: Who is directed by when "fade" is the title?
SQL: SELECT "directed_by" FROM episodes_42 WHERE "title" = '"Fade"'

Question: Who is the directed by when 2t6404 is the production code?
SQL: SELECT "directed_by" FROM episodes_42 WHERE "production_code" = '2T6404'