Auto increment primary key in SQL Server Management Studio 2012
How do I auto increment the primary key in a SQL Server database table, I’ve had a look through the forum but can’t see how.
I’ve looked the the properties but can’t see an option, I have seen an answer where you go to the Identity specification property and set it to yes and set the Identity increment to 1, but that section is grayed out and I can’t change the no to yes.
There must be a simple way to do this but I can’t find it.
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Make sure that the Key column’s datatype is
int and then setting identity manually, as image shows
Or just run this code
-- ID is the name of the [to be] identity column ALTER TABLE [yourTable] DROP COLUMN ID ALTER TABLE [yourTable] ADD ID INT IDENTITY(1,1)
the code will run, if
ID is not the only column in the table
image reference fifo’s
When you’re creating the table, you can create an
IDENTITY column as follows:
CREATE TABLE ( ID_column INT NOT NULL IDENTITY(1,1) PRIMARY KEY, ... );
IDENTITY property will auto-increment the column up from number 1. (Note that the data type of the column has to be an integer.) If you want to add this to an existing column, use an
ALTER TABLE command.
Tested a bit, and I can’t find a way to change the Identity properties via the Column Properties window for various tables. I guess if you want to make a column an identity column, you HAVE to use an
ALTER TABLE command.
You have to expand the Identity section to expose increment and seed.
Edit: I assumed that you’d have an integer datatype, not char(10). Which is reasonable I’d say and valid when I posted this answer
Expand your database, expand your table right click on your table and select design from dropdown.
Now go Column properties below of it scroll down and find Identity Specification, expand it and you will find Is Identity make it Yes. Now choose Identity Increment right below of it give the value you want to increment in it.
Perhaps I’m missing something but why doesn’t this work with the SEQUENCE object? Is this not what you’re looking for?
CREATE SCHEMA blah. GO CREATE SEQUENCE blah.blahsequence START WITH 1 INCREMENT BY 1 NO CYCLE; CREATE TABLE blah.de_blah_blah (numbers bigint PRIMARY KEY NOT NULL ......etc
When referencing the squence in say an INSERT command just use:
NEXT VALUE FOR blah.blahsequence
More information and options for SEQUENCE
When you’re using Data Type: int you can select the row which you want to get autoincremented and go to the column properties tag. There you can set the identity to ‘yes’. The starting value for autoincrement can also be edited there. Hope I could help 😉
Be carefull like if you want the ID elements to be contigius or not. As SQLSERVER ID can jump by 1000 .
Examle: before restart ID=11
after restart , you insert new row in the table, then the id will be 1012.
If the table is already populated it is not possible to change a column to IDENTITY column or convert it to non IDENTITY column. You would need to export all the data out then you can change column type to IDENTITY or vice versa and then import data back.
I know it is painful process but I believe there is no alternative except for using sequence as mentioned in this post.