Auto increment primary key in SQL Server Management Studio 2012

Question

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

User · Answer

Perhaps I m missing something but why doesn t this work with the SEQUENCE object   Is this not what you re looking for   Example   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

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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

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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

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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             The 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   Edit  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

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I had this issue where I had already created the table and could not change it without dropping the table so what I did was   Not sure when they implemented this but had it in SQL 2016   Right click on the table in the Object Explorer   Script Table as  gt  DROP And CREATE To  gt  New Query Editor Window  Then do the edit to the script said by Josien  scroll to the bottom where the CREATE TABLE is  find your Primary Key and append IDENTITY 1 1  to the end before the comma  Run script   The DROP and CREATE script was also helpful for me because of this issue   Which the generated script handles

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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

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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

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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

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CREATE TABLE Persons       Personid int IDENTITY 1 1  PRIMARY KEY      LastName varchar 255  NOT NULL      FirstName varchar 255       Age int      The MS SQL Server uses the IDENTITY keyword to perform an auto-increment feature   In the example above  the starting value for IDENTITY is 1  and it will increment by 1 for each new record   Tip  To specify that the  Personid  column should start at value 10 and increment by 5  change it to IDENTITY 10 5    To insert a new record into the  Persons  table  we will NOT have to specify a value for the  Personid  column  a unique value will be added automatically

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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

User · Answer

You can use the keyword IDENTITY as the data type to the column along with PRIMARY KEY constraint when creating the table  ex   StudentNumber IDENTITY 1 1  PRIMARY KEY   In here the first  1  means the starting value and the second  1  is the incrementing value

[sql-server] Auto increment primary key in SQL Server Management Studio 2012

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