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 are name of all the roller coasters?
assistant
SELECT name FROM Roller_coaster;
human
Which of them is the longest?
assistant
SELECT name FROM roller_coaster ORDER BY LENGTH DESC LIMIT 1;
human
Give me its speed.
assistant
SELECT Speed FROM roller_coaster ORDER BY LENGTH DESC LIMIT 1 ;