Task: Text to Code
Input (English): Step 1: find the cust_name of customer table.
Step 2: find the cust_name of customer table for which acc_type equals Mortgages.
Step 3: show the rows that are in the results of step 1 but not in the results of step 2
Output (English): SELECT cust_name FROM customer EXCEPT SELECT cust_name FROM customer WHERE acc_type = "Mortgages"