CREATE TABLE race (track_id VARCHAR)
CREATE TABLE track (name VARCHAR, location VARCHAR, track_id VARCHAR)

Show the name and location of track with 1 race.
SELECT T2.name, T2.location FROM race AS T1 JOIN track AS T2 ON T1.track_id = T2.track_id GROUP BY T1.track_id HAVING COUNT(*) = 1
SELECT "T2"."name", "T2"."location" FROM "race" AS "T1" JOIN "track" AS "T2" ON "T1"."track_id" = "T2"."track_id" GROUP BY "T1"."track_id" HAVING COUNT(*) = 1