Task: Text to Code
Input (English): Step 1: find the cmi_cross_ref_id of CMI_Cross_References table.
Step 2: find the cmi_cross_ref_id of Rent_Arrears table.
Step 3: show the rows that are in the results of step 1 but not in the results of step 2
Output (English): SELECT T1.cmi_cross_ref_id FROM CMI_Cross_References AS T1 EXCEPT SELECT T2.cmi_cross_ref_id FROM Rent_Arrears AS T2