SQL Server: creating table variable, error in primary key constraint definition

Question

I\'m trying to create a table variable with primary key. What is the difference between these two statements? Why the first one does not work?

--This does not wo         


        

Answer 1

The syntax you're using is for CREATE TABLE, not table variables.

CREATE TABLE tabvar (
    rowid int identity(1, 1) not null,
    var1 int null
       , constraint PK_tabvar_rowid primary key clustered (rowid)
)

The above works fine, as expected. However if you look at the syntax for declaring table variables you'll see what you can and can't do:

declare @tabvar table (
    rowid int identity(1, 1) not null,
    var1 int null,
       primary key (rowid)
)