SQL:别名列上的内部联接

Question

以前我曾要求从字段中删除文本并将其转换为 int，这很成功。但是现在，我想对这个新值进行 INNER JOIN。

所以我有这个:

SELECT CONVERT(int, SUBSTRING(accountingTab.id, PATINDEX('%[0-9]%', accountingTab.id), 999)) 
AS 'memId',  userDetails.title, userDetails.lname 
FROM accountingTab INNER JOIN
(SELECT id, title, first, last FROM memDetTab) AS userDetails ON memID = userDetails.id

然后我得到无效的列名 memID错误。

我怎样才能解决这个问题？

Answer 1

您可以重复整个表达式或反转您的连接:

SELECT *
FROM memDetTab
    JOIN (SELECT CONVERT(int, SUBSTRING(accountingTab.id, PATINDEX('%[0-9]%', accountingTab.id), 999)) AS 'memId', userDetails.title, userDetails.lname
FROM accountingTab) subquery
    ON subquery.memID = memDetTab.ID