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how to alter the existing id values to idetity(1,1)

  • August 29, 2013 at 8:36 am

    #395393

    hi,

    I have created the table like

    create table tblemployee(id int,name varchar(10),gender int)

    the table does not have any records..

    now how to add identity seed and increment values like identity(1,1) ..

    i have tried it is working from table design how to write T-sql query for that.

    Thanks,

    Giri

  • August 29, 2013 at 8:45 am

    #1646017

    You can't add the identity property to an existing table/column.

    If you script out the change through the table designer, you'll see the script actually creates a new table with the identity property, copies the data, deletes the original table, and then renames the new table to the original name.

    If there's no data in the table you can safely drop and recreate it, be sure to include any referenced or referencing constraints though.

  • August 29, 2013 at 8:46 am

    #1646019

    You could try something along the lines of:

    ALTER TABLE XXX

    ALTER COLUMN ID INT IDENTITY(1,1)

    That would modify your Id column to being an identity column with a seed value of 1 and an increment value of 1.

    Please pay no attention to the idiot walking through... 🙂

  • August 29, 2013 at 9:00 am

    #1646022

    Just wishful thinking 🙂

  • August 29, 2013 at 9:22 am

    #1646027

    ALTER TABLE dbo.tblemployee

    ADD ident int IDENTITY(1, 1) NOT NULL

    Edit: Added "NOT NULL"

    SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.

  • August 29, 2013 at 9:35 am

    #1646032

    Ha, I did not know you could do that!

  • August 29, 2013 at 8:55 pm

    #1646211

    ScottPletcher (8/29/2013)

    ALTER TABLE dbo.tblemployee

    ADD ident int IDENTITY(1, 1) NOT NULL

    Edit: Added "NOT NULL"

    The NOT NULL is great visual confirmation that the column will be NOT NULL, but the IDENTITY property will make the column NOT NULL if you wanted to leave the NOT NULL off.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

  • August 30, 2013 at 3:10 am

    #1646254

    ScottPletcher (8/29/2013)

    ALTER TABLE dbo.tblemployee

    ADD ident int IDENTITY(1, 1) NOT NULL

    Edit: Added "NOT NULL"

    You are adding a new column with IDENTITY property and it works..

    The thing is that we cant add IDENTITY property to any existing column of table...

    _______________________________________________________________
    To get quick answer follow this link:
    http://www.sqlservercentral.com/articles/Best+Practices/61537/

  • August 30, 2013 at 9:53 am

    #1646411

    kapil_kk (8/30/2013)

    ScottPletcher (8/29/2013)

    ALTER TABLE dbo.tblemployee

    ADD ident int IDENTITY(1, 1) NOT NULL

    Edit: Added "NOT NULL"

    You are adding a new column with IDENTITY property and it works..

    The thing is that we cant add IDENTITY property to any existing column of table...

    No, you simply cannot do that directly.

    You would have to export the table, recreate the table definition, then import with IDENTITY_INSERT ON to use an existing column as an IDENTITY value.

    SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.

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