根据每个where子句以增加的值更新列

Question

I like to update each row with incremented value based on the where condition.

exp: select ClientId from [Document] Where ClientId 10 Shows 3 result then I need to update each matterID with 1 to 3.

1 clientId has one or many MatterID so Need to update each matterID based on number of matterID for each client. IF client 10 holds 3 matterID then matterIDs would be 1 - 2 - 3

Not: It is not updating correctly I am getting matterIDs for this example ramdom number not 1-39-39.

Stored Procedure

    Alter PROCEDURE dbo.CustomIdProcedure 
    @clientId varchar(255) = ''
    AS 

    Begin           
            update e set MatterId = rn  from (select * ,rn=row_number() over (order by id) from [Document] where ClientId  = @clientId ) e
    END 

**

To run the Procedure

** exec CustomIdProcedure (select ClientId from [Document] Where ClientId <>'')

Answer 1

You can use a subquery or updatable CTE for this:

with toupdate as (
      select d.*,
             row_number() over (partition by clientid order by id) as rn
      from [Document] d
      where ClientId = @clientid
     )
update toupdate
    set MatterId = rn;