how to renumber identity column

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how to renumber identity column when any row is deleted

Posted 15-Dec-12 3:31am

arvind parashar

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Hasham Ahmad · Answer 1 · 2012-12-15T04:08:00

Solution 2

SQL

DBCC CHECKIDENT ("table1", RESEED, 300)

use the above to set the starting index number.
300 will be the starting indexed number when you insert after executing the above query

Posted 15-Dec-12 4:08am

Hasham Ahmad

Updated 15-Dec-12 4:09am

v2

Liju Sankar · Answer 2 · 2012-12-15T18:27:00

AS Griff rigtly pointed out, please try to avoid this scenarion.

I you really need this, please use the ReSeed funtinality in SQL Server

These links will answer your questions

1. Sql-server-reseed-identity-of-table-table-missing-identity-values-gap-in-identity-column]

2. Sql-server-delete-truncate-and-reseed-identity

OriginalGriff · Answer 3 · 2012-12-15T03:48:00

Simple rule: Don't.

It will cause more problems that it will solve. The problem is that it is intended that the ID should be unique - so when you delete a row, you would have to renumber all the rows with higher numbers. What if that ID is being used in a different table as a foreign key? All of those must be renumbered as well - including any records which are loaded into the memory of other instances of your application, or any other application using the same database. And what if you get two deletes at the same time from different users? What should the new number sequence be?

If you want sequential numbers, there are other solutions - but do not try to subvert an identity field as it will cause a lot of intermittent problems in production that may not be apparent in development.

Krunal Rohit · Answer 4 · 2012-12-15T18:17:00

Solution 4

As OrginialGriff don't do this.. Refer MSDN[^]

Posted 15-Dec-12 18:17pm

Krunal Rohit

arvind parashar · Answer 5 · 2012-12-15T18:12:00

Solution 3

EmpID EmpName
1 Arvind
2 Praveen
3 Sunil
4 Naveen

if i delete 2nd record then the preceding record must me renumbered like in below table

EmpID EmpName
1 Arvind
2 Sunil
3 Naveen

plz give your best answer to maintain identity column

Posted 15-Dec-12 18:12pm