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Need help with sequence

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abhijitheie
Starting Member

2 Posts

Posted - 2013-01-29 : 02:36:59

Hi,

I have a column with name "CustomerNumber". I want to get increment the max value of this column by 1 and then return me the incremented number. I know we have to do this through stored procedures and sequence generators. but im not sure how exactly. please explain.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-01-29 : 02:46:15

the best way to deal with this is to make the column an identity one so that values will get incremented automatically
If you want to simulate it,use


DECLARE @MaxID int
SELECT @MaxID=MAX(CustomerNumber)
FROM Customers
SELECT COALESCE(@MaxID,0) + 1 AS NextIDValue

please be aware that for batch insertions you've to generate bunch of new id values and above method wont work.
For that you need to make use of a temporary table with identity column itself.

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

LoztInSpace
Aged Yak Warrior

940 Posts

Posted - 2013-01-29 : 21:24:30

It's highly likely you really want to use an "Identity" column for this, or, in SQL 2012, an actual SEQUENCE object which is even better. If you intend to use the number and write it back then be aware that Visakah's method only really works reliably for single user. With multiple users (connections actually) you either end up gummed up serialised behind locks or reusing numbers depending on your isolation model.

abhijitheie
Starting Member

2 Posts

Posted - 2013-01-30 : 00:23:17

LoztInSpace,

Can u explain how to do it step by step?

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2013-01-30 : 07:06:16

http://blogs.msdn.com/b/askjay/archive/2012/10/08/sequence-objects-in-sql-2012-and-sql-2008.aspx

How to ask: http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

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