CREATE TABLE election (Delegate VARCHAR2, District VARCHAR2)
CREATE TABLE county (County_id VARCHAR2, Population NUMBER)

How many distinct delegates are from counties with population larger than 50000?
SELECT COUNT(DISTINCT T2.Delegate) FROM county AS T1 JOIN election AS T2 ON T1.County_id = T2.District WHERE T1.Population > 50000
SELECT COUNT(DISTINCT "T2"."Delegate") FROM "county" "T1" JOIN "election" "T2" ON "T1"."County_id" = "T2"."District" WHERE "T1"."Population" > 50000