human
Schema:
roller_coaster (Roller_Coaster_ID, Name, Park, Country_ID, Length, Height, Speed, Opened, Status)
country (Country_ID, Name, Population, Area, Languages)
Please answer with SQL.
assistant
Sure, I understand.
human
What is the height of the highest roller coaster?
assistant
SELECT MAX( height ) FROM roller_coaster;
human
Which park is this roller coaster located at?
assistant
SELECT park FROM roller_coaster WHERE height = ( SELECT MAX( height ) FROM roller_coaster );
human
What is the name of the country that has the highest roller coaster?
assistant
SELECT T2.name FROM roller_coaster AS T1 JOIN country AS T2 ON T1.country_id = T2.country_id WHERE T1.height = ( SELECT MAX( height ) FROM roller_coaster );
human
Hmm, I also want to know the population of this country.
assistant
SELECT T2.name , T2.population FROM roller_coaster AS T1 JOIN country AS T2 ON T1.country_id = T2.country_id WHERE T1.height = ( SELECT MAX( height ) FROM roller_coaster ) ;