How to assign ROW_NUMBER() to a column?

Question

After reading this question , I have another similar question. Is there a simple way to get this SQL statement to work?

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

I have a RowNo column which I want to update whenever a record is deleted.

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

I would join the table to a subquery (not sure if you can do that in SQL Server) or create a view and join the table to that in the update:

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

(assuming you have a primary key named insuranceID )

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

Hope this helps.

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