如果行数= 1且有条件，则有条件

Question

我对sql结果以及如何实现以下内容有疑问。

在屏幕截图中，每个ID都有一个行号，每个ID都有另一列，其状态为“旧”或“已处理”。 我想要的是，如果RN = 1且已处理状态，则此ID的所有其他RN都应具有“已处理”状态。

有可能在sql中实现吗？

SELECT RN = ROW_NUMBER() OVER (PARTITION BY [NODE_NAME]
ORDER by REPORTING_RELEVANT_STATUS_ID DESC, BILLING_PERIOD DESC)
      ,[CI_EQUIPMENT_ID] AS ID_PART
      ,[REPORTING_RELEVANT_STATUS_ID] AS REPORTING_RELEVANT
      ,[BILLING_PERIOD]
     , [NODE_NAME]
        FROM Table

Answer 1

将您的查询放在CTE中？ 然后将其与实际表联接：

;WITH cte AS (
SELECT RN = ROW_NUMBER() OVER (PARTITION BY [NODE_NAME]
ORDER by REPORTING_RELEVANT_STATUS_ID DESC, BILLING_PERIOD DESC)
      ,[CI_EQUIPMENT_ID] AS ID_PART
      ,[REPORTING_RELEVANT_STATUS_ID] AS REPORTING_RELEVANT
      ,[BILLING_PERIOD]
     , [NODE_NAME]
        FROM Table
)

SELECT  t.[CI_EQUIPMENT_ID] AS ID_PART,
        CASE WHEN c.RN is NOT NULL THEN c.REPORTING_RELEVANT ELSE t.[REPORTING_RELEVANT_STATUS_ID] END AS REPORTING_RELEVANT,
        t.[BILLING_PERIOD],
        t.[NODE_NAME]
FROM Table t
LEFT JOIN (
    SELECT *
    FROM cte
    WHERE RN = 1 AND REPORTING_RELEVANT = 'PROCESSED'
) as c
    ON c.ID_PART = t.[CI_EQUIPMENT_ID] 

Answer 2

• 创建公用表表达式
• 根据RN = 1和Status = Processed更新CTE值。 使用自我联接

这里：

;with CTE (RN,ID_PART,REPORTING_RELEVANT,BILLING_PERIOD,NODE_NAME) AS
(

  SELECT RN = ROW_NUMBER() OVER (PARTITION BY [NODE_NAME]
            ORDER by REPORTING_RELEVANT_STATUS_ID DESC, BILLING_PERIOD DESC)
      ,[CI_EQUIPMENT_ID] AS ID_PART
      ,[REPORTING_RELEVANT_STATUS_ID] AS REPORTING_RELEVANT
      ,[BILLING_PERIOD]
      , [NODE_NAME]
  FROM Table
)
Update CTE1
  set CTE1.Status='Processed'
from CTE CTE1 inner join CTE CTE2
  on CTE1.ID_PART=CTE2.ID_PART
where CTE2.RN=1 and CTE2.Status='Processed'