Question

我正在为作业的数据库创建一个视图，

我的代码中仍然出现此错误。

CREATE VIEW Rental_View

SELECT Mo.Movie_ID, copy_id, mo.Movie_Name, format_name
FROM Movies AS mo JOIN copies AS co
ON mo.Movie_ID = co.movie_id  
JOIN format AS fo
ON co.Format_id = fo.format_id

SELECT c.customer_id, rental_ID, DATEDIFF (day, rental_date, return_date) AS  rental_duration' , c.first_name + ' ' + c.last_name AS customer_name
FROM Customers AS c INNER JOIN rentals AS r
ON c.customer_ID = r.customer_ID

在第一个SELECT语句中，它带有下划线红色，我得到错误

“关键字'SELECT'附近的语法不正确。”

我真的不知道如何纠正这个因为我对SQL很新，任何帮助都会非常感激。

提前感谢。

Answer 1

您需要 AS 关键字：

CREATE VIEW Rental_View   AS            --- <------ AS needed here

SELECT mo.Movie_ID                     --- mo, not Mo
     , co.copy_id                      --- play safe and declare which table 
     , mo.Movie_Name
     , fo.format_name                  --- are these two columns from
FROM Movies AS mo JOIN copies AS co
ON mo.Movie_ID = co.movie_id  
JOIN format AS fo
ON co.Format_id = fo.format_id  
;                                     --- add a ; if you want to
                                      --- run multiple statements

如果您想将两个SELECT合并为一个，则需要JOIN两者中的表格，如下所示：

CREATE VIEW Rental_View   AS           

SELECT mo.Movie_ID                     
     , co.copy_id                      
     , mo.Movie_Name
     , fo.format_name                  
     , c.customer_id
     , rental_ID
     , DATEDIFF (day, rental_date, return_date) AS rental_duration 
     , c.first_name + ' ' + c.last_name AS customer_name
FROM Movies AS mo 
  JOIN copies AS co
    ON mo.Movie_ID = co.movie_id  
  JOIN format AS fo
    ON co.Format_id = fo.format_id  

  JOIN rentals AS r
    ON r.movie_id = mo.Movie_id        --- just a guess, you have to write this
  JOIN Customers AS c 
    ON c.customer_ID = r.customer_ID

Answer 2

CREATE VIEW Rental_View
AS

您缺少“AS”关键字

Answer 3

在此代码rental_duration之后，您看起来顶部有错误的单引号 -

SELECT c.customer_id, rental_ID, DATEDIFF (day, rental_date, return_date) AS  rental_duration' , c.first_name + ' ' + c.last_name AS customer_name
FROM Customers AS c INNER JOIN rentals AS r
ON c.customer_ID = r.customer_ID

尝试

SELECT c.customer_id, rental_ID, DATEDIFF (day, rental_date, return_date) AS  rental_duration , c.first_name + ' ' + c.last_name AS customer_name
FROM Customers AS c INNER JOIN rentals AS r
ON c.customer_ID = r.customer_ID

Answer 4

您可以尝试更改

中的第一个选择

SELECT Mo.Movie_ID ，copy_id，mo.Movie_Name，format_name

到

SELECT mo.Movie_ID ，copy_id，mo.Movie_Name，format_name

Answer 5

您发布的代码中存在多个错误。

CREATE VIEW语句需要ASEC关键字作为SELECE语句。你可以这样做：

CREATE VIEW Rental_View
AS
SELECT Mo.Movie_ID, copy_id, mo.Movie_Name, format_name
FROM Movies AS mo JOIN copies AS co
ON mo.Movie_ID = co.movie_id  
JOIN format AS fo
ON co.Format_id = fo.format_id

我可以看到另一个SELECT语句，它在视图中没有任何意义。添加第二个SELECT语句将导致错误“关键字'SELECT'附近的语法不正确。”对于第二个SELECT语句。

Answer 6

尝试：

CREATE VIEW Rental_View
AS
  SELECT Mo.Movie_ID, copy_id, mo.Movie_Name, format_name
  FROM Movies AS mo JOIN copies AS co
  ON mo.Movie_ID = co.movie_id  
  JOIN format AS fo
  ON co.Format_id = fo.format_id

CREATE VIEW Rental_Duration
AS
      SELECT c.customer_id, rental_ID, DATEDIFF (day, rental_date, return_date) AS  rental_duration , c.first_name +   ' ' + c.last_name AS customer_name
      FROM Customers AS c INNER JOIN rentals AS r
     ON c.customer_ID = r.customer_ID

通常，您不会创建将返回多个结果集的视图。如果这真的是你想要的，那么BEGIN / END块应该可以解决问题（未经测试 - 现在不在任何RDMS之前）：

CREATE VIEW Rental_View
AS
BEGIN
  SELECT Mo.Movie_ID, copy_id, mo.Movie_Name, format_name
  FROM Movies AS mo JOIN copies AS co
  ON mo.Movie_ID = co.movie_id  
  JOIN format AS fo
  ON co.Format_id = fo.format_id

  SELECT c.customer_id, rental_ID, DATEDIFF (day, rental_date, return_date) AS  rental_duration , c.first_name +   ' ' + c.last_name AS customer_name
      FROM Customers AS c INNER JOIN rentals AS r
     ON c.customer_ID = r.customer_ID
END

关键字'SELECT'附近的语法不正确。创建视图错误

6 个答案: