Task: Text to Code
Input (English): Step 1: find the Tourist_Attraction_ID of Visits table.
Step 2: find the number of rows in Tourist_Attractions table whose Tourist_Attractions's Tourist_Attraction_ID not one of the results of step 1
Output (English): SELECT Count ( * ) FROM Tourist_Attractions AS T1 WHERE T1.Tourist_Attraction_ID NOT IN ( SELECT T2.Tourist_Attraction_ID FROM Visits AS T2 )