Tuesday, February 21, 2017

SQL Server Sequence suddenly starts with -2147483648

Have you faced this? Assume that you have created a Sequence object for generating values sequentially for tables which data type is set as int, and suddenly it shows the next number as -2147483648.

See below code;

-- creating sequence
CREATE SEQUENCE [dbo].[OrderSequence]
AS int
START WITH 1 
INCREMENT BY 1 
MAXVALUE 2 
CYCLE
GO

-- requesting numbers three times
SELECT (NEXT VALUE FOR   dbo.OrderSequence) AS OrderSequence
GO 3



What could be the reason? If you analyze the code written above, you can easily find the issue. I have not used MINVALUE property when creating the Sequence, hence it takes the lowest value of the data type set for the Sequence, which is -2147483648 for int data type. You may experience the same, if so, check and see whether the MINVALUE has been set or not.

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