SQL Server에서 MySQL의 SUBSTRING_INDEX() 함수 기능을 구현하는 방법은 무엇입니까?

CREATE FUNCTION dbo.SUBSTRING_INDEX
(
    @str NVARCHAR(4000),
    @delim NVARCHAR(1),
    @count INT
)
RETURNS NVARCHAR(4000)
WITH SCHEMABINDING
AS
BEGIN
    /* T-SQL Scalar Function Code */
END;

SELECT dbo.SUBSTRING_INDEX(N'www.somewebsite.com', N'.', 2);

CREATE FUNCTION dbo.SUBSTRING_INDEX
(
    @str NVARCHAR(4000),
    @delim NVARCHAR(1),
    @count INT
)
RETURNS TABLE
AS RETURN
    /* TSQL Inline Table-Valued Function Code */

SELECT  *
FROM    (
    SELECT N'www.somewebsite.com' UNION ALL 
    SELECT N'www.yahoo.com' UNION ALL 
    SELECT N'www.outlook.com'
) a(Value)
CROSS APPLY dbo.SUBSTRING_INDEX(a.Value, N'.', 2) b;