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


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

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dastagiri16
dastagiri16
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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
Gazareth
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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.
logitestus
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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... :-)
Gazareth
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Just wishful thinking :-)
ScottPletcher
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ALTER TABLE dbo.tblemployee
ADD ident int IDENTITY(1, 1) NOT NULL

Edit: Added "NOT NULL"

SQL DBA,SQL Server MVP(07, 08, 09) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.
Gazareth
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Ha, I did not know you could do that!
Jeff Moden
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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.
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kapil_kk
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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...

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ScottPletcher
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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) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.
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