human
Schema:
swimmer (ID, name, Nationality, meter_100, meter_200, meter_300, meter_400, meter_500, meter_600, meter_700, Time)
stadium (ID, name, Capacity, City, Country, Opening_year)
event (ID, Name, Stadium_ID, Year)
record (ID, Result, Swimmer_ID, Event_ID)
Please answer with SQL.
assistant
Sure, I understand.
human
Find the name of the stadium that has the maximum capacity.
assistant
SELECT name FROM stadium ORDER BY capacity DESC LIMIT 1
human
How many stadiums does each country have?
assistant
SELECT country , count(*) FROM stadium GROUP BY country
human
Which country has both stadiums with capacity greater than 60000 and stadiums with capacity less than 50000?
assistant
SELECT country FROM stadium WHERE capacity > 60000 INTERSECT SELECT country FROM stadium WHERE capacity < 50000
human
How many stadiums are there?
assistant
SELECT count(*) FROM stadium
human
How many cities have a stadium that was opened before the year of 2006?
assistant
SELECT count(DISTINCT city) FROM stadium WHERE opening_year < 2006
human
What is the average capacity of the stadiums that were opened in year 2005?
assistant
SELECT avg ( capacity ) FROM stadium WHERE opening_year = 2005 ;