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_name_47 (air_date VARCHAR)
  ### Question:
  What is the total number of ratings among the 18 to 49 group that was aired on January 7, 2009?
  ### Answer:
  SELECT COUNT(18 AS _49) FROM table_name_47 WHERE air_date = "january 7, 2009"