Question

您好我正在尝试使用以下内容创建视图：

CREATE OR REPLACE VIEW CONCERT_EVENTS1 AS
SELECT CONCERT.CONCERT_ID, EVENT.EVENT_ID, CONCERT.NAME, EVENT.DATE1 , CONCERT.DURATION,
CONCERT.COST AS TO_CHAR(COST, 'L9,999.99')                
FROM EVENT
INNER JOIN CONCERT
ON CONCERT.CONCERT_ID = EVENT.CONCERT_ID;

以下是我收到的错误：

Error starting at line 1 in command:
CREATE OR REPLACE VIEW CONCERT_EVENTS1 AS
SELECT CONCERT.CONCERT_ID, EVENT.EVENT_ID, CONCERT.NAME, EVENT.DATE1 , CONCERT.DURATION,
CONCERT.COST AS TO_CHAR(COST, 'L9,999.99')       
FROM EVENT
INNER JOIN CONCERT
ON CONCERT.CONCERT_ID = EVENT.CONCERT_ID
Error at Command Line:2 Column:113
Error report:
SQL Error: ORA-00923: FROM keyword not found where expected
00923. 00000 -  "FROM keyword not found where expected"
*Cause:    
*Action:

我的SQL有什么问题？

Answer 1

AS语句不正确。 AS用于选择重命名列。所以CONCERT.COST作为CONCERT_COST会在您的视图中将列重命名为CONCERT_COST。如果要格式化列，则在as：

的左侧

TO_CHAR(CONCERT.COST, 'L9,999.99')  AS FORMATED_COST

如果您仍想重命名该列。

Answer 2

您的＆＃34; AS TO_CHAR（费用，＆＃39; L9,999.99＆＃39;）＆＃34;是不对的。＆＃34; As＆＃34;声明用于对列进行别名，您不希望将列命名为＆＃34; TO_CHAR（COST，＆＃39; L9,999.99＆＃39;）＆＃34;

我相信你想要的是：

CREATE OR REPLACE VIEW CONCERT_EVENTS1 AS
SELECT CONCERT.CONCERT_ID, EVENT.EVENT_ID, CONCERT.NAME, EVENT.DATE1 , CONCERT.DURATION,
TO_CHAR(CONCERT.COST, 'L9,999.99') as 'ALIAS_HERE'
FROM EVENT
INNER JOIN CONCERT
ON CONCERT.CONCERT_ID = EVENT.CONCERT_ID;

Answer 3

此消息始终指示查询投影中的语法错误，即SELECT和FROM关键字之间的位：

ORA-00923: FROM keyword not found where expected

你仍然得到它，因为你已经消除了原始布鲁姆的建议修复。现在您有COST列的两个声明....

CONCERT.COST TO_CHAR(CONCERT.COST, 'L9,999.99') AS FORMATED_COST

语法要求我们在投影中的每一列之间加上逗号：

CREATE OR REPLACE VIEW CONCERT_EVENTS1 AS 
    SELECT CONCERT.CONCERT_ID
            , EVENT.EVENT_ID
            , CONCERT.NAME
            , EVENT.DATE1 
            , CONCERT.DURATION
            , CONCERT.COST
            , TO_CHAR(CONCERT.COST, 'L9,999.99') AS FORMATED_COST 
FROM EVENT INNER 
      JOIN CONCERT 
         ON CONCERT.CONCERT_ID = EVENT.CONCERT_ID

或者，如果您不想在视图中使用数字COST列，请将其删除。

我知道语法错误对初学者来说很难，但你真的需要学会用冷静的眼光看待自己的代码。每当你删掉一个逗号时，你都无法运行到SO。以适当的方式布置代码将有助于：更容易阅读的代码更易于调试。出于同样的原因，您应该避免将所有代码都放在大写字母中。

创建视图错误

3 个答案: