CREATE TABLE "table1_17355820_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);

Question: Which episodes did Nelson McCormick direct?
SQL: SELECT "written_by" FROM "table1_17355820_1" WHERE "directed_by"='Nelson McCormick';

Question: How many episodes were there in season 19?
SQL: SELECT COUNT("title") FROM "table1_17355820_1" WHERE "season_num"=19;

Question: In which season did Paul McCrane first direct an episode?
SQL: SELECT MIN("season_num") FROM "table1_17355820_1" WHERE "directed_by"='Paul McCrane';

Question: On which dates did the episodes directed by TR Babu Subramaniam air?
SQL: SELECT "original_air_date" FROM "table1_17355820_1" WHERE "directed_by"='TR Babu Subramaniam';

Question: Who directed the episode titled "the advocate"?
SQL: SELECT "directed_by" FROM "table1_17355820_1" WHERE "title"='\"The Advocate\"';