public class Match : IEntity
{
    public virtual int ID { get; set; }
    public virtual string Word { get; set; }
    public virtual int WordIntervalBeginning { get; set; }
    public virtual int WordIntervalEnding { get; set; }
}

CREATE TABLE [dbo].[tMatchesTest](
    [ID] [int] IDENTITY( 1 , 1 ) NOT NULL,
    [Word] [varchar]( 50 ) NOT NULL,
    [WordIntervalBeginning] [int] NOT NULL,
    [WordIntervalEnding] [int] NOT NULL,
 CONSTRAINT [PK_tMatchesTest] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

CREATE FUNCTION ftMatchTest
( )
RETURNS TABLE 
AS
RETURN 
(
    SELECT mt1.*, mt2.*,
    CASE WHEN mt1.Word = mt2.Word THEN  1  ELSE  0  END AS sc
    FROM
        dbo.tMatchesTest mt1, dbo.tMatchesTest mt2
)

public class FResult
{
    public Match Match1 { get; set; }
    public Match Match2 { get; set; }
    public int sc { get; set; }
}