How many distinct locations have the things with service detail 'Unsatisfied' been located in?
CREATE TABLE Timed_Locations_of_Things (Location_Code VARCHAR, thing_id VARCHAR); CREATE TABLE Things (thing_id VARCHAR, service_details VARCHAR)
[SQL] SELECT COUNT(DISTINCT T2.Location_Code) FROM Things AS T1 JOIN Timed_Locations_of_Things AS T2 ON T1.thing_id = T2.thing_id WHERE T1.service_details = 'Unsatisfied' [/SQL]