Task: Text to Code
Input (English): Step 1: find the first_name of customer table.
Step 2: For each row in customer table, find the corresponding rows in rental table.
Step 3: find first_name of the results of step 2 whose return_date greater than 2005-08-23 02:06:01.
Step 4: show the rows that are in the results of step 1 but not in the results of step 3
Output (English): SELECT T1.first_name FROM customer AS T1 EXCEPT SELECT T1.first_name FROM customer AS T1 JOIN rental AS T2 ON T1.customer_id = T2.customer_id WHERE T2.return_date > "2005-08-23 02:06:01"