如何将ROW_NUMBER（）分配给列？

Question

读完这个问题后 ，我有另一个类似的问题。 有一种简单的方法可以使这个SQL语句工作吗？

update [Insurances] set [RowNo]=ROW_NUMBER() over (order by [RowNo])

我有一个RowNo列，我想在删除记录时更新。

Answer 1

UPDATE t1 
SET t1.RowNo = s.RowNo  
FROM  [Insurances] t1
INNER JOIN
(
     SELECT Id, ROW_NUMBER() OVER( ORDER BY Somefield DESC) RowNo
     FROM Insurances
) s ON t1.Id = s.Id

Answer 2

我会将表连接到子查询（不确定您是否可以在SQL Server中执行此操作）或创建视图并将表连接到更新中的表：

CREATE VIEW InsurancesView AS
SELECT insuranceID, ROW_NUMBER() OVER ( ORDER BY RowNo ) AS newRowNo
  FROM Insurances;

（假设您有一个名为insuranceID的主键）

UPDATE Insurances AS i
 INNER JOIN InsurancesView AS iv
    ON i.insuranceID = iv.insuranceID
   SET i.RowNo = iv.newRowNo;

希望这可以帮助。

Answer 3

WITH cte AS
(
SELECT Id, ROW_NUMBER() OVER(ORDER BY Name ) RowNo FROM lu_Domain
)
UPDATE dbo.lu_Domain
SET SortOrder = cte.RowNo
FROM dbo.lu_Domain d
INNER JOIN cte ON cte.id = d.Id