Table: tv_episode_data_119
Columns: no_in_series
no_in_season
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_million

Question: Who wrote the episode with the production code of 3t7255?
SQL: SELECT "written_by" FROM tv_episode_data_119 WHERE "production_code" = '3T7255'

Question: How many U.S. viewers (million) watched the episode directed by Allison Liddi-Brown?
SQL: SELECT "u_s_viewers_million" FROM tv_episode_data_119 WHERE "directed_by" = 'Allison Liddi-Brown'

Question: What is the total number of production code listings of episodes written by Matthew Lau?
SQL: SELECT COUNT("production_code") FROM tv_episode_data_119 WHERE "written_by" = 'Matthew Lau'