CREATE TABLE "overview_of_main_characters" (
  "character" text,
  "actor" text,
  "years" text,
  "series" text,
  "episode_count" real
);

Question: How many Episode Counts have an Actor of liz carr?
SQL: SELECT COUNT("episode_count") FROM "overview_of_main_characters" WHERE "actor"='liz carr';

Question: Which Years have a Character of dr trevor stewart?
SQL: SELECT "years" FROM "overview_of_main_characters" WHERE "character"='dr trevor stewart';

Question: Which Series has an Actor of tom ward?
SQL: SELECT "series" FROM "overview_of_main_characters" WHERE "actor"='tom ward';