Partial rows in the same table are automatically re-numbered T-SQL processing code

Source: Internet
Author: User
-- Some rows in the same table are automatically re-numbered for T-SQL ProcessingCode

Select Identity (INT, 1, 1) as ID, * into # From DS order by department

Select department, min (ID) as N, max (ID) as m into # DMN
From #
Group by department

Update DS set Ds. [sequence] = A. ID-(D. N-1)
From # As A, # DMN as d
Where a. custid = Ds. custid and A. Department = D. Department

Drop table #
Drop table # DMN

-- Appendix: scripts generated and execution results of the DS table

Create Table [DBO]. [DS] (
[Custid] [int] not null primary key,
[Department] [varchar] (50) Collate chinese_prc_ci_as not null,
[Sequence] [int] Null
) On [primary]

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