SQL Server: DENSE_RANK ()

Question

I have a tableA: (ID int, batch int, new_batch int)

ID and batch are populated already:

ID  Batch New_Batch
1   01    NULL
2   01    NULL
3   02    NULL
4   02    NULL
5   02    NULL
6   03    NULL
7   04    NULL
8   05    NULL

Now I want to populate New_batch according to the following select statement.

(select batch from tableA where id in (3,8))

1. now for this select statement, we get batch = 02 and batch =5. now I want to assign new_batch such that the result of select statement should be ordered first (batch02 then batch05) and the remaining data should be ordered in increasing order of batch NOT in select statement. (batch 1,3,4) result should be:

---

      ID Batch New_Batch
       1   01    03
       2   01    03
       3   02    01
       4   02    01
       5   02    01
       6   03    04
       7   04    05
       8   05    02

Thanks. PS: DENSE_RANK() can be used, and please dont hard-code !!

Answer 1

declare @T table
(
  ID int,
  Batch char(2),
  New_Batch char(2)
)

insert into @T values
(1,   '01',    NULL),
(2,   '01',    NULL),
(3,   '02',    NULL),
(4,   '02',    NULL),
(5,   '02',    NULL),
(6,   '03',    NULL),
(7,   '04',    NULL),
(8,   '05',    NULL)

;with C as
(
  select T1.New_Batch,
         dense_rank() over(order by -T2.ID desc, T1.Batch) as rn
  from @T as T1
    left outer join (select Batch, ID 
                     from @T
                     where ID in (3, 8)) as T2
      on T1.Batch = T2.Batch 
)
update C 
set New_Batch = right(100+rn, 2)


select *
from @T
order by ID

Try here : https://data.stackexchange.com/stackoverflow/q/113031/

Answer 2

/*Please provide DDL like the below for future questions*/
DECLARE @tableA TABLE
(
ID INT PRIMARY KEY,
Batch INT,
New_Batch INT NULL
)

INSERT INTO @tableA(ID,Batch)
SELECT 1,1 UNION ALL
SELECT 2,1 UNION ALL   
SELECT 3,2 UNION ALL   
SELECT 4,2 UNION ALL   
SELECT 5,2 UNION ALL   
SELECT 6,3 UNION ALL   
SELECT 7,4 UNION ALL   
SELECT 8,5   

/*Answer*/
;WITH T
     AS (SELECT *,
                DENSE_RANK() OVER (ORDER BY 
                      CASE
                        WHEN Batch IN (SELECT Batch
                                       FROM   @tableA
                                       WHERE  ID IN ( 3, 8 )) 
                         THEN 0 
                         ELSE 1 END, Batch) AS NB
         FROM   @tableA)
UPDATE T
SET    New_Batch = NB

SELECT *
FROM   @tableA