无法在FROM子句错误中指定要更新的目标表

Question

有些人可以帮我解决这个问题吗

UPDATE
    LoadBal_WebAPI_RequestDetails
SET
    status='vamsi'
WHERE
    requestID in (select `lb`.`requestId` AS `requestID` from (`LoadBal_WebAPI_RequestDetails` `lb` join `Global_AR_Processes` `ar` on((`ar`.`processId` = `lb`.`processRegistryId`))) where ((`lb`.`status` = 'Received') and (`ar`.`isProcessAvailable` = 1)) order by `lb`.`lastUpdatedDateTime` )
    LIMIT 1; 

我收到错误1093 - 无法在FROM子句

中指定更新目标表

我是查询写作的新手，所以建议我解决错误

谢谢

Answer 1

我认为您应该使用嵌套表作为select语句中的select，如此

UPDATE tbl SET col =（    SELECT ... FROM（SELECT .... FROM）AS x ）; 的

Answer 2

尝试以下查询：

UPDATE
    LoadBal_WebAPI_RequestDetails
SET
    status='vamsi'
WHERE
    requestID in (select t1.requestID FROM 
    (select requestId, processRegistryId from LoadBal_WebAPI_RequestDetails where `status` = 'Received' order by `lastUpdatedDateTime`) t1 JOIN
    `Global_AR_Processes` `ar` on `ar`.`processId` = t1.processRegistryId and `ar`.`isProcessAvailable` = 1)
    LIMIT 1;