SELECT DISTINCT A.ID, A.MT_NO, A.OPERATION, A.UNIT, F.STD_TIMES, A.WORK_TIMES, A.STD_CODE, A.UPDATE_BY, A.UPDATE_TIME, F.OPERATION_DESC, F.OPERATION_ENG, F.OPERATION_ACTION, F.CYCLE, F.PART_NO FROM tpmdata.EMS_M_DOC_OPERATION A LEFT JOIN TPMDATA.EMS_M_DOC_HEAD B ON A.MT_NO = B.MT_NO LEFT JOIN tpmdata.EMS_M_SYS_SCHEDULE C ON B.schedule_id = C.ID LEFT JOIN tpmdata.EMS_M_SYS_PLAN D ON D.ID = C.plan_id LEFT JOIN tpmdata.EMS_M_SYS_HEAD E ON D.operation_id = E.ID LEFT JOIN TPMDATA.EMS_M_SYS_ITEM F ON F.OPERATION_GROUP_ID = E.ID where A.MT_NO = '23-2023maintenancePlan-DY-002'; SQL中DISTINCT失效，查询数据有重复，如何用字段中的UPDAT_TIME在查询出来的数据过滤出最新时间的数据，展示SQL

您可以使用子查询和MAX函数来过滤出最新时间的数据，并展示在SQL查询结果中。以下是修改后的SQL查询语句：

SELECT DISTINCT
        A.ID,
        A.MT_NO,
        A.OPERATION,
        A.UNIT,
        F.STD_TIMES,
        A.WORK_TIMES,
        A.STD_CODE,
        A.UPDATE_BY,
        A.UPDATE_TIME,
        F.OPERATION_DESC,
        F.OPERATION_ENG,
        F.OPERATION_ACTION,
        F.CYCLE,
        F.PART_NO
FROM
        tpmdata.EMS_M_DOC_OPERATION A
LEFT JOIN TPMDATA.EMS_M_DOC_HEAD B ON A.MT_NO = B.MT_NO
LEFT JOIN tpmdata.EMS_M_SYS_SCHEDULE C ON B.schedule_id = C.ID
LEFT JOIN tpmdata.EMS_M_SYS_PLAN D ON D.ID = C.plan_id
LEFT JOIN tpmdata.EMS_M_SYS_HEAD E ON D.operation_id = E.ID
LEFT JOIN TPMDATA.EMS_M_SYS_ITEM F ON F.OPERATION_GROUP_ID = E.ID
WHERE 
        A.MT_NO = '23-2023maintenancePlan-DY-002'
AND
        A.UPDATE_TIME = (
                SELECT MAX(UPDATE_TIME)
                FROM tpmdata.EMS_M_DOC_OPERATION
                WHERE MT_NO = '23-2023maintenancePlan-DY-002'
        );

这样修改后的查询语句将根据字段中的UPDATE_TIME过滤出最新时间的数据，并确保结果中没有重复的记录。请注意将'MT_NO'值替换为您要过滤的特定值。