别名子查询不工作

Question

我有以下代码：

SELECT 
CU.customer_ID AS "Customer ID", 
CU.cust_LNAME AS "Last Name", 
CU.cust_FNAME AS "First Name", 
RH.movie_ID AS "Movie ID", 
MO.movie_title AS "Movie Title", 
MO.release_year AS "Release Year", 
(
SELECT COUNT(*) FROM RentalHistory RH2 WHERE RH2.movie_ID = RH.movie_ID AND RH2.customer_ID = RH.customer_ID HAVING COUNT(*) > 1 
) "Nbr. Of Times Rented" 
FROM Customer CU 
RIGHT JOIN Rentalhistory RH ON (RH.customer_ID = CU.customer_ID) 
INNER JOIN Movie MO ON (MO.movie_ID = RH.movie_ID) 
GROUP BY CU.customer_ID, RH.movie_ID  
HAVING "Nbr. Of Times Rented" > 1 
ORDER BY CU.cust_LNAME ASC, CU.cust_FNAME ASC; 

我不断收到无效的标识符别名子查询？任何想法，我做错了什么？

Answer 1

我不认为你需要子查询。这是否做你想要的？

SELECT CU.customer_ID AS "Customer ID", 
     CU.cust_LNAME AS "Last Name", 
     CU.cust_FNAME AS "First Name", 
     RH.movie_ID AS "Movie ID", 
     MO.movie_title AS "Movie Title", 
     MO.release_year AS "Release Year", 
     COUNT(*) as "Nbr. Of Times Rented" 
FROM Customer CU RIGHT JOIN 
    Rentalhistory RH 
    ON RH.customer_ID = CU.customer_ID INNER JOIN 
    Movie MO 
    ON MO.movie_ID = RH.movie_ID 
GROUP BY CU.customer_ID, RH.movie_ID  
HAVING count(*) > 1 
ORDER BY CU.cust_LNAME ASC, CU.cust_FNAME ASC;