Task: Text to Code
Input (English): Step 1: find the rID of Reviewer table.
Step 2: find the Rating's rID of Rating table for which stars equals 4.
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.rID FROM Reviewer AS T1 EXCEPT SELECT T2.rID FROM Rating AS T2 WHERE T2.stars = 4