Question

我是Oracle SQL的新手，对于我的生活，我无法弄清楚为什么我会继续收到错误＆＃34;错过右括号＆＃34;在我的代码上。我已经找到了缺失或额外的逗号和括号，但无法弄明白。请帮忙！我的查询如下：

CREATE VIEW PRODUCT_SUMMARY_V 
AS SELECT 
PROD_ID, 
EXTRACT (CALENDAR_YEAR FROM TIME_ID) "YEAR", 
EXTRACT (CALENDAR_MONTH_NAME FROM TIME_ID) "MONTH",  
SUM(AMOUNT_SOLD) "TOTAL_AMOUNT_SOLD", 
SUM(QUANTITY_SOLD) "TOTAL_QUANTITY_SOLD",
ROUND(SUM(AMOUNT_SOLD)/SUM(QUANTITY_SOLD),2) "AVG_SALE_PRICE"
FROM MY_SALES
GROUP BY PROD_ID, CALENDAR_YEAR, CALENDAR_MONTH_NAME
ORDER BY PROD_ID;

Answer 1

您在TIME_ID函数的帮助下从EXTRACT()中提取了错误的值。

  SQL> CREATE VIEW PRODUCT_SUMMARY_V 
  AS SELECT 
  PROD_ID, 
  EXTRACT (YEAR FROM TIME_ID) "YEAR", 
  EXTRACT (MONTH FROM TIME_ID) "MONTH",  
  SUM(AMOUNT_SOLD) "TOTAL_AMOUNT_SOLD", 
  SUM(QUANTITY_SOLD) "TOTAL_QUANTITY_SOLD",
  ROUND(SUM(AMOUNT_SOLD)/ SUM(QUANTITY_SOLD),2) "AVG_SALE_PRICE"
  FROM MY_SALES
  GROUP BY PROD_ID, EXTRACT (YEAR FROM TIME_ID), EXTRACT (MONTH FROM TIME_ID)
  ORDER BY PROD_ID;  

 View created.

但是，错误消息具有误导性，因为EXTRACT函数的参数不正确，并将其视为表的列。语法检查器将语句视为SELECT EXTRACT(CALENDAR_YEAR FROM TIME_ID。

SQL> SELECT EXTRACT(CALENDAR_YEAR FROM TIME_ID;
SELECT EXTRACT(CALENDAR_YEAR FROM TIME_ID
                             *
ERROR at line 1:
ORA-00907: missing right parenthesis

详细信息：Extract

在Oracle中创建虚拟视图时出现错误代码

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