在连接中使用 CTE 更新表中的记录

Question

我一直在看这个更新声明，其中包括对 cte 的连接。无法找出问题所在。它给了我：“语法错误：意外的‘更新’。（第 7 行）”。不知道我错过了什么。谢谢！

WITH SALESORDER_CTE AS 
(
    SELECT TO_TIMESTAMP(ORDERITEMDRUGMODIFIED, 'MM/DD/YYYY HH12:MI:SS PM') AS CUSTBODY_ORDERITEMDRUGMODIFIED, *, 
        ROW_NUMBER() OVER (PARTITION BY TRANID ORDER BY ORDERITEMDRUGMODIFIED DESC) AS RN
    FROM SALESORDER
)
UPDATE a
SET a.ORDERITEMDRUGMODIFIED = b.ORDERITEMDRUGMODIFIED
FROM SALESORDERLINE AS a
INNER JOIN SALESORDER_CTE AS b ON a.TRANSACTION = b.ID
WHERE b.RN = 1
AND b.ID = 5369076;

Answer 1

我在这里看到两个语法问题。首先，连接条件是隐式的，应该出现在

WHERE

子句中，因为不支持

ON

。其次，

SET

子句的左侧不应有别名。试试这个版本：

UPDATE a
SET ORDERITEMDRUGMODIFIED = b.ORDERITEMDRUGMODIFIED
FROM SALESORDERLINE AS a
INNER JOIN SALESORDER_CTE AS b
WHERE a.TRANSACTION = b.ID AND
      b.RN = 1 AND
      b.ID = 5369076;