Question

如何在SQL Server 2008 R2中使用row_number添加列？

BEGIN TRANSACTION 

DECLARE @count int 
DECLARE @maxcount int 
SET @count = 1

SET @maxcount = (SELECT count(*)
                 FROM   Applicant_Detail ad
                 WHERE  ad.identification_code = 1)
PRINT @maxcount

WHILE (@count<@maxcount)
BEGIN
    UPDATE ad
    SET    ad.NRIC_nbr = s.myRowNumber
    FROM   Applicant_Detail ad
    INNER JOIN   (
               SELECT ROW_NUMBER() OVER (ORDER BY NRIC_nbr ASC) AS myRowNumber
               FROM   Applicant_Detail ad
           )S
      ON   s.myRowNumber = @count
      SET @count = @count+1
END

此查询需要花费大量时间。我在applicant_detail表中没有任何具有顺序数据的列？我使用计数逻辑但需要很多时间？

我想要什么？
使用顺序数据更新表的列，如表1,2,3,4,5,6,7,8,9 ......最大行？

Answer 1

试试这个：

declare @count int = (select count(1) from Applicant_Detail)

;with cte as 
(select *, row_number() over (order by @count) rn
 from Applicant_Detail)

 update cte
 set NRIC_nbr = rn

 select * from Applicant_Detail

Demo

Answer 2

解决此问题的方法

BEGIN TRANSACTION 
;WITH numbering AS 
( SELECT AD.NRIC_nbr,
         AD.application_number,
         ROW_NUMBER() OVER(ORDER BY AD.application_number) AS ROWNUMBER 
  FROM   Applicant_Detail ad WHERE AD.identification_code=1
)
UPDATE numbering 
SET NRIC_nbr=ROWNUMBER

Answer 3

当您想要使用row_numebr更新列时。这是完美的解决方案

WITH TEMP AS （ SELECT id as rid， ROW_NUMBER（）OVER（ORDER BY [ID] ASC）作为RN 来自ORG ）更新ORG设置columnname1 ='200'+（选择RN FROM TEMP，其中TEMP.rid = ORG.id）

如何在SQL Server中使用row_number更新列？

3 个答案: