Task: Text to Code
Input (English): Step 1: find the start_date of trip table.
Step 2: find the start_date of trip table for which zip_code equals 94107.
Step 3: show the rows that are in the results of step 1 but not in the results of step 2
Output (English): SELECT start_date FROM trip EXCEPT SELECT start_date FROM trip WHERE zip_code = 94107