CREATE TABLE "transmissions" (
  "series" real,
  "start_date" text,
  "end_date" text,
  "episodes" real,
  "average_viewers_millions" text
);

Question: When did series 6 start?
SQL: SELECT "start_date" FROM "transmissions" WHERE "series"=6;

Question: What series had an average of 3.72 million people watching it?
SQL: SELECT MAX("series") FROM "transmissions" WHERE "average_viewers_millions"='3.72';

Question: How many different end dates are there for the series seen by 4.2 million people?
SQL: SELECT COUNT("end_date") FROM "transmissions" WHERE "average_viewers_millions"='4.2';