SQL Server/T-SQL Tutorial/Sequence Indentity/IDENTITYCOL

SELECT IDENTITYCOL FROM yourTable

2> CREATE TABLE customer
3> (
4> cust_id      smallint        IDENTITY(100, 20)  NOT NULL,
5> cust_name    varchar(50)     NOT NULL
6> )
7> GO
1>
2> INSERT customer VALUES ("ACME Widgets")
3> INSERT customer (cust_name) VALUES ("AAA Gadgets")
4> GO
(1 rows affected)
(1 rows affected)
1>
2>
3> SELECT IDENTITYCOL FROM customer
4> SELECT cust_id FROM customer
5> GO
cust_id
-------
    100
    120
(2 rows affected)
cust_id
-------
    100
    120
(2 rows affected)
1>
2> drop table customer;
3> GO

Using the IDENTITYCOL Keyword

24> CREATE TABLE MyTable (
25>  key_col int NOT NULL IDENTITY (1,1),
26>  abc     char(1) NOT NULL
27> )
28> INSERT INTO MyTable VALUES ("a")
29> INSERT INTO MyTable VALUES ("b")
30> INSERT INTO MyTable VALUES ("c")
31>
32>
33> SELECT
34>  IDENTITYCOL,
35>  abc
36> FROM
37>  MyTable
38>
39>
40> drop table MyTable
41> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
key_col     abc
----------- ---
          1 a
          2 b
          3 c
(3 rows affected)