CREATE TABLE [dbo].[T4]
(
    [col_1] NVARCHAR(10) NOT NULL,
    [col_2] NVARCHAR(10) NOT NULL,
    [col_3] NVARCHAR(10) NULL,
    [col_4] NVARCHAR(10) NULL
)
GO
 
ALTER TABLE [dbo].[T4]
   ADD CONSTRAINT [FK__T4__0000000000000004]
   FOREIGN KEY([col_1],[col_2])
   REFERENCES [dbo].[T3]([col1],[col2])
GO