where 子句中的别名不起作用

Question

我有由大字符串组成的列RESPONSE_XML and REQUEST_XML。我对这个大字符串使用了 substring 函数，以便从 RESPONSE_XML 中获取 SUBSCRIPTION_ID 并从 REQUEST_XML 中获取 orderType。查询工作正常。但现在我想为这个查询设置条件，使其只返回 orderType='NEW' 的 SUBSCRIPTION_ID。我将两个子字符串的结果存储到别名中，并在 where 条件下使用这些别名。但它不起作用并给出错误ORA-01722 Invalid numnber。这是我的查询：

    SELECT REPLACE(REPLACE(REGEXP_SUBSTR(RESPONSE_XML, '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>\d+</ax2130:id>'), 
    '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>', ''), '</ax2130:id>', '') 
    AS SUBSCRIPTION_ID , 
    REPLACE(REPLACE(REGEXP_SUBSTR(REQUEST_XML, '<ns7:orderType>\d+</ns7:orderType>'), '<ns7:orderType>', ''), '</ns7:orderType>', '') 
    AS order_type
    FROM
    SOAP_MONITORING 
    where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder' 
and order_type='NEW' order by CREATE_DATE desc

我也尝试过以这种方式查询，但结果是错误，即第 10 行的 ORA-00932 数据类型不一致

SELECT REPLACE(REPLACE(REGEXP_SUBSTR(RESPONSE_XML, '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>\d+</ax2130:id>'), 
'<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>', ''), '</ax2130:id>', '') 
AS SUBSCRIPTION_ID from SOAP_MONITORING 
where 
REQUEST_XML
in
(
REPLACE(REPLACE(REGEXP_SUBSTR(REQUEST_XML, '<ns7:orderType>\d+</ns7:orderType>'), '<ns7:orderType>', ''), '</ns7:orderType>', '') 
)
and WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder' and REQUEST_XML='NEW'

Answer 1

为了对列别名做谓词（WHERE），您可以使用内联视图（也称为子查询，虽然子查询实际上更普遍地用于不同的事情）或common表表达式（也称为 CTE 或“with”子句）。

内联视图你可以这样做：

select iw.order_type
from (
   SELECT REPLACE(REPLACE(REGEXP_SUBSTR(RESPONSE_XML, '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>\d+</ax2130:id>'), 
   '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>', ''), '</ax2130:id>', '') 
   AS SUBSCRIPTION_ID , 
   REPLACE(REPLACE(REGEXP_SUBSTR(REQUEST_XML, '<ns7:orderType>\d+</ns7:orderType>'), '<ns7:orderType>', ''), '</ns7:orderType>', '') 
   AS order_type,
   CREATE_DATE
   FROM
   SOAP_MONITORING 
   where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder' 
) iw
where iw.order_type='NEW'
order by iw.CREATE_DATE desc

常见的表表达式你可以这样做：

with cte as (
   SELECT REPLACE(REPLACE(REGEXP_SUBSTR(RESPONSE_XML, '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>\d+</ax2130:id>'), 
   '<ax2147:subscriptions xsi:type="ax2127:SubscriptionDTO"><ax2130:id>', ''), '</ax2130:id>', '') 
   AS SUBSCRIPTION_ID , 
   REPLACE(REPLACE(REGEXP_SUBSTR(REQUEST_XML, '<ns7:orderType>\d+</ns7:orderType>'), '<ns7:orderType>', ''), '</ns7:orderType>', '') 
   AS order_type,
   CREATE_DATE
   FROM
   SOAP_MONITORING 
   where WEB_SERVICE_NAME='RatorWebShopService' and WEB_METHOD_NAME='placeShopOrder' 
)
select cte.order_type
from cte
where cte.order_type='NEW'
order by cte.CREATE_DATE desc