mssql function return value

CREATE FUNCTION test_function_search (@찾을값 int)
 RETURNS varchar(10)
 AS
 BEGIN 
    DECLARE @넘기는값 varchar(10)
 
    SET @넘기는값 = '지금은없음'
 
    SELECT @넘기는값 = body 
    FROM test_table_for_function
    WHERE idx = @찾을값
 
    RETURN (@넘기는값)
 END
 
 위와 같이 FUNCTION을 하나 만듭니다.
 
 select idx, body, dbo.test_function_search(idx) As fromFunc
 from test_table_for_function