text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_21304155_1 (production_code VARCHAR, directed_by VARCHAR)
  ### Question:
  What is the production code of the episode directed by David Solomon? 
  ### Answer:
  SELECT production_code FROM table_21304155_1 WHERE directed_by = "David Solomon"