SQL - 关键字附近的语法不正确

Question

我的查询出现小问题:

CREATE VIEW rental_view
AS 
   SELECT 
       m.movie_id, movie_name, co.copy_id, 
       f.format_id, format_name, cu.customer_id, 
       (first_name + ' ' + surname) AS customer_name, 
       rental_id, rental_date, return_date, 
       ISNULL(return_date, CAST(DATEDIFF(dd, rental_date, GETDATE() ) AS rental_duration 
   FROM 
         movie AS m 
   INNER JOIN copy AS co ON m.movie_id = co.movie_id
   INNER JOIN format AS f ON co.format_id = f.format_id
   INNER JOIN rental ON co.copy_id = rental.copy_id
   INNER JOIN customer AS cu ON rental.customer_id = cu.customer_id

结果有误:

Msg 156,Level 15,State 1,
Procedure rental_view,Line 3关键字'FROM'附近的语法不正确.

我长期尝试这个并无法解决它.

感谢帮助.

Answer 1

你在这一行上缺少两个括号:

AS SELECT 
    m.movie_id, movie_name, co.copy_id, f.format_id, format_name, 
    cu.customer_id, (first_name + ' ' + surname) AS customer_name, 
    rental_id, rental_date, return_date, 
    ISNULL(
        return_date, 
        CAST(DATEDIFF(dd, rental_date, GETDATE()))) AS rental_duration 

无论如何,你的语法在其他部分是错误的:

• CAST希望转换字段,关键字AS和新类型(请参阅文档)
• DATEDIFF想要两个参数(参见文档)< - 如果您使用的是MySql; 用MS-SQL是正确的