What is the rating of the show ranked tba, aired on April 21, 2009?
CREATE TABLE table_name_63 (rating VARCHAR, rank___number_ VARCHAR, air_date VARCHAR)
SELECT rating FROM table_name_63 WHERE rank___number_ = "tba" AND air_date = "april 21, 2009"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_63 (rating VARCHAR, rank___number_ VARCHAR, air_date VARCHAR) Question: What is the rating of the show ranked tba, aired on April 21, 2009? [/INST] SELECT rating FROM table_name_63 WHERE rank___number_ = "tba" AND air_date = "april 21, 2009" </s>