Question: What was the name of the episode directed by Jessica Yu?
SQL: SELECT "Title" FROM "1-23492454-1" WHERE "Directed by" = 'Jessica Yu';

Question: who directed the episode written by Shonda Rhimes?
SQL: SELECT "Directed by" FROM "1-23492454-1" WHERE "Written by" = 'Shonda Rhimes';

Question: How many episodes in the series are also episode 18 in the season?
SQL: SELECT COUNT("No. in series") FROM "1-23492454-1" WHERE "No. in season" = 18.0;