What is Population density (per km²), when Name is Antigua and Barbuda, and when Capital is St. John's?
CREATE TABLE table_name_81 (population_density__per_km²_ VARCHAR, name VARCHAR, capital VARCHAR)
SELECT population_density__per_km²_ FROM table_name_81 WHERE name = "antigua and barbuda" AND capital = "st. john's"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_81 (population_density__per_km²_ VARCHAR, name VARCHAR, capital VARCHAR) Question: What is Population density (per km²), when Name is Antigua and Barbuda, and when Capital is St. John's? [/INST] SELECT population_density__per_km²_ FROM table_name_81 WHERE name = "antigua and barbuda" AND capital = "st. john's" </s>