Table: tv_episode_2
Columns: series
title
story_by
teleplay_by
directed_by
original_air_date

Question: Who directed series #4 that was teleplayed by David Simon?
SQL: SELECT COUNT("directed_by") FROM tv_episode_2 WHERE "teleplay_by" = 'David Simon' AND "series" = 4

Question: What is the title of series #1?
SQL: SELECT "title" FROM tv_episode_2 WHERE "series" = 1