Table: ballpark_history
Columns: ballpark
location
team
opened
closed
demod
current_status

Question: Where is the ballpark of the Twins?
SQL: SELECT "location" FROM ballpark_history WHERE "team" = 'Twins'

Question: How many locations have been used for ballparks named Memorial Stadium?
SQL: SELECT COUNT("location") FROM ballpark_history WHERE "ballpark" = 'Memorial Stadium'

Question: When was the park demolished in 1994 closed?
SQL: SELECT MIN("closed") FROM ballpark_history WHERE "demod" = 1994