CREATE TABLE CMI_Cross_References (cmi_cross_ref_id VARCHAR, master_customer_id VARCHAR)
CREATE TABLE Business_Rates (cmi_cross_ref_id VARCHAR)

How many business rates are related to each cmi cross reference? List cross reference id, master customer id and the n
SELECT T2.cmi_cross_ref_id, T2.master_customer_id, COUNT(*) FROM Business_Rates AS T1 JOIN CMI_Cross_References AS T2 ON T1.cmi_cross_ref_id = T2.cmi_cross_ref_id GROUP BY T2.cmi_cross_ref_id
SELECT "T2"."cmi_cross_ref_id", "T2"."master_customer_id", COUNT(*) FROM "Business_Rates" AS "T1" JOIN "CMI_Cross_References" AS "T2" ON "T1"."cmi_cross_ref_id" = "T2"."cmi_cross_ref_id" GROUP BY "T2"."cmi_cross_ref_id"