Who wrote the episode where the original air date is july20,2007?
CREATE TABLE table_25716399_1 (written_by VARCHAR, original_air_date VARCHAR)
SELECT written_by FROM table_25716399_1 WHERE original_air_date = "July20,2007"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_25716399_1 (written_by VARCHAR, original_air_date VARCHAR) Question: Who wrote the episode where the original air date is july20,2007? [/INST] SELECT written_by FROM table_25716399_1 WHERE original_air_date = "July20,2007" </s>