Table: episodes_viewers_7
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
us_viewers_millions

Question: What is the production code for the episode title "A Wrong Day's Journey into Right"?
SQL: SELECT "production_code" FROM episodes_viewers_7 WHERE "title" = '"A Wrong Day''s Journey into Right"'

Question: How many episodes had the us viewers (millions) figure of 5.0?
SQL: SELECT COUNT("no_in_season") FROM episodes_viewers_7 WHERE "us_viewers_millions" = '5.0'

Question: Who are the writers for the episode number in series 129?
SQL: SELECT "written_by" FROM episodes_viewers_7 WHERE "no_in_series" = 129

Question: What is the us viewers (millions) figure for the episode titled "Witch Wars"?
SQL: SELECT "us_viewers_millions" FROM episodes_viewers_7 WHERE "title" = '"Witch Wars"'