CREATE TABLE [dbo].[T3]
(
    [col1] NVARCHAR(10) NOT NULL,
    [col2] NVARCHAR(10) NOT NULL,
    [col3] NVARCHAR(10) NULL,
    [col4] NVARCHAR(10) NULL
)
GO
 
ALTER TABLE  [dbo].[T3]
   ADD CONSTRAINT [PK__T3__0000000000000003]
   PRIMARY KEY([col1],[col2])
GO