CREATE TABLE "table1_28081876_4" (
  "series_no" real,
  "season_no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real
);

Question: how many people wrote the episode directed by rob schrab?
SQL: SELECT COUNT("written_by") FROM "table1_28081876_4" WHERE "directed_by"='Rob Schrab';

Question: name the title of the episode with production code 201
SQL: SELECT "title" FROM "table1_28081876_4" WHERE "production_code"=201;