CREATE TABLE club (club_id VARCHAR, club_name VARCHAR)
CREATE TABLE coach (club_id VARCHAR)

How many coaches does each club has? List the club id, name and the number of coaches.
SELECT T1.club_id, T1.club_name, COUNT(*) FROM club AS T1 JOIN coach AS T2 ON T1.club_id = T2.club_id GROUP BY T1.club_id
SELECT "T1"."club_id", "T1"."club_name", COUNT(*) FROM "club" AS "T1" JOIN "coach" AS "T2" ON "T1"."club_id" = "T2"."club_id" GROUP BY "T1"."club_id"