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