Which Doctor Who episode has a Original airdate (UK) of dvd only?
CREATE TABLE table_name_51 (doctor_who_episode VARCHAR, original_airdate__uk_ VARCHAR)
SELECT doctor_who_episode FROM table_name_51 WHERE original_airdate__uk_ = "dvd only"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_51 (doctor_who_episode VARCHAR, original_airdate__uk_ VARCHAR) Question: Which Doctor Who episode has a Original airdate (UK) of dvd only? [/INST] SELECT doctor_who_episode FROM table_name_51 WHERE original_airdate__uk_ = "dvd only" </s>