how to add primary key column with auto increment in sql server

Question

i have one existing table in that i need to add primary column with auto increment(1,1). how to write query for to insert one primary key column with identity(1,1). getting error -

"Incorrect syntax near the keyword 'IDENTITY".

table ALTER TABLE OLTMS_0B8DF2
        ADD PRIMARY KEY (ID);

i tried like this

ALTER TABLE OLTMS_0B8DF2
ADD PRIMARY KEY (ID) int IDENTITY(1,1);

getting error

Answer 1

You should use inline constraint syntax

ALTER TABLE OLTMS_0B8DF2
ADD ID INT IDENTITY(1,1) PRIMARY KEY