-- Database schema
| roller_coaster : Roller_Coaster_ID [ INT ] primary_key , Name [ TEXT ] , Park [ TEXT ] , Country_ID [ INT ] roller_coaster.Country_ID = country.Country_ID , Length [ INT ] , Height [ INT ] , Speed [ TEXT ] , Opened [ TEXT ] , Status [ TEXT ] | country : Country_ID [ INT ] primary_key , Name [ TEXT ] , Population [ INT ] , Area [ INT ] , Languages [ TEXT ] |
-- -- How many roller coasters are there?

SELECT count(*) FROM roller_coaster;