Question: What are their cmi cross reference IDs?
SQL: SELECT t1.master_customer_id,cmi_cross_ref_id FROM  Customer_Master_Index as t1 join CMI_Cross_References as t2 on t1.master_customer_id = t2.master_customer_id where t1.cmi_details not in  ( 'Schmidt, Kertzmann and Lubowitz' )