How I can change the incerement value of cloumn

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I have a table and have a lot of records and i can't drop and recreate it
I need to change the increment value of the Id column to 2 the old value is 1

this is an example of the table I need to change the identity increment of

SQL

CREATE TABLE [dbo].[RELATED](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [RELATEDDESC] [nvarchar](50) NOT NULL,
    [USER_ID] [int] NULL,
    [ALTER_DATE] [datetime2](7) NULL,
PRIMARY KEY CLUSTERED
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

Posted 18-Oct-15 23:38pm

samerselo

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Tomas Takac 19-Oct-15 6:45am

Did you try ALTER TABLE?

samerselo 19-Oct-15 7:51am

yes but it gives me error on identity
could you please give me a tested example

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OriginalGriff · Accepted Answer · 2015-10-19T00:55:00

Solution 1

Try:

SQL

[Id] [int] IDENTITY(2,3) NOT NULL

That will start the value at 2, and increase it by 3 each time:

2
5
8
...

Posted 19-Oct-15 0:55am

OriginalGriff

Comments

samerselo 19-Oct-15 7:49am

yes
but I need to alter existing table with lots of data

I have no problem creating new table

OriginalGriff 19-Oct-15 8:19am

If you have lots of data, then you need to be extremely careful - you would be best creating a new table with the new identity rule, transfer all your data, and then remove the original and rename the new.

The only other approach is to drop the existing column, and create a new one - you can't modify an existing IDENTITY specification.

ALTER TABLE [dbo].[MyTable]
DROP COLUMN myColumn
GO
ALTER TABLE [dbo].[MyTable]
ADD myColumn int IDENTITY (2, 5)
GO