Update the query with increment

Question

Hi, How I can update the column r2 with the new number. r2 column which needs to be updated from 300000 with increment 1.
drop table #cric
create table #cric (r1 int, r2 int, rt char(4),rp char(6))
insert into #cric values (111111,0,'GR','ATYOP')
insert into #cric values (222222,0,'GE','ATYOP')
insert into #cric values (100112,0,'TX','ATYOR')
insert into #cric values (100113,0,'TX','ATYOP')
insert into #cric values (100114,0,'TS','ATYOS')
insert into #cric values (100117,0,'TS','ATYOP')
insert into #cric values (100118,0,'TS','ATYOP')
--Output
Select * from #cric
r1    r2    rt    rp
111111    300000    GR      ATYOP
222222    300001    GE      ATYOP
100112    300002    TX      ATYOR
100113    300003    TX      ATYOP
100114    300004    TS      ATYOS
100117    300005    TS      ATYOP
100118    300006    TS      ATYOP
Thanks.

Answer 1

This is easily achieved with the row_number() function:
create table #cric (r1 int, r2 int, rt char(4),rp char(6))
insert into #cric values (111111,0,'GR','ATYOP')
insert into #cric values (222222,0,'GE','ATYOP')
insert into #cric values (100112,0,'TX','ATYOR')
insert into #cric values (100113,0,'TX','ATYOP')
insert into #cric values (100114,0,'TS','ATYOS')
insert into #cric values (100117,0,'TS','ATYOP')
insert into #cric values (100118,0,'TS','ATYOP')
go
WITH numbering AS (
   SELECT r2, rowno = row_number() OVER(ORDER BY r1)
   FROM   #cric
UPDATE numbering
SET    r2 = 30000 + rowno
go
SELECT * FROM #cric
go
drop table #cric
Except that this will not give you the result you are asking for. But there is no apparent indication why you want exactly that order. Hm, maybe
   ORDER BY substring(rt, 1, 1), substring(rt, 2, 1) DESC
But that is a little far-fetched.
If you really mean that the rows are inserted, there is no way to safely do this, unless you have a column that records the insertion order. You could try "ORDER BY (SELECT NULL)" but that really means "any order, I don't care which".
Erland Sommarskog, SQL Server MVP, [email protected]