create table ALPHABET
(
id int IDENTITY(1,1),
Characters NCHAR(1) PRIMARY KEY )

DECLARE @asciiCode INT= 65 WHILE @asciiCode <= 90 BEGIN

INSERT ALPHABET ( Characters ) SELECT CHAR(@asciiCode)

SELECT @asciiCode = @asciiCode + 1

END
USE [master]
GO
/****** Object: Table [dbo].[order_point]  Script Date: 04/02/2018 18:35:33 ******/

CREATE TABLE [dbo].[order_point](
    [order1] [varchar](50) NULL,
    [point] [int] NULL,
    [numero2] [nvarchar](50) NULL
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order1', 1)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order2', 1)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order3', 3)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order4', 6)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order5', 8)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order6', 10)
INSERT [dbo].[order_point] ([order1], [point]) VALUES (N'Order7', 10)

update C
set C.numero2=A.Characters
from ALPHABET A
INNER JOIN order_point C
ON C.point=A.id

select * from ALPHABET

select * from order_point