What was the original air date of Stargate SG-1 written by Peter Deluise?
CREATE TABLE table_15431959_1 (original_air_date VARCHAR, written_by VARCHAR)
SELECT original_air_date FROM table_15431959_1 WHERE written_by = "Peter DeLuise"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_15431959_1 (original_air_date VARCHAR, written_by VARCHAR) Question: What was the original air date of Stargate SG-1 written by Peter Deluise? [/INST] SELECT original_air_date FROM table_15431959_1 WHERE written_by = "Peter DeLuise" </s>