How to select a max row for each group in SQL

Dear Frindz,

I want select countries with maximum value of 'Value' for a 'grpid'.  Also already selected 'Country' should not be considered for other 'grpid' while checking the maximum. ( ie Country or grpid should not be repeated in the result )

CREATE TABLE [dbo].[test1](

       [Country] [varchar](4) NULL,

       [grpid] [int] NOT NULL,

       [Value] [float] NULL,

       [Row_number] [bigint] NULL

) ON [PRIMARY]



GO

SET ANSI_PADDING OFF

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'US', 49707, 604456458, 1)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'US', 909, 604456458, 2)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'US', 231, 604456457, 3)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GB', 5086, 497654945, 4)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GB', 50147, 405759433, 5)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GB', 909, 405759433, 6)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GB', 231, 405759433, 7)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CA', 49707, 353500201, 8)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CA', 5086, 353500201, 9)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CA', 909, 353500201, 10)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CA', 231, 353500201, 11)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'JP', 49707, 198291290, 12)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'JP', 5086, 198291290, 13)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'JP', 909, 198291290, 14)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'JP', 231, 198291290, 15)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'MX', 49707, 181884714, 16)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'MX', 909, 181884714, 17)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'MX', 231, 181884714, 18)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'BR', 49707, 105147054, 19)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'BR', 5086, 105147054, 20)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'BR', 909, 105147054, 21)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'AR', 49707, 94774929, 22)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'AR', 5086, 94774929, 23)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'AR', 909, 94774929, 24)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'AR', 231, 94774929, 25)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'ZA', 49707, 84560514, 26)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'ZA', 909, 84560514, 27)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'ZA', 231, 84560514, 28)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CN', 49707, 68966682, 29)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CN', 909, 68966682, 30)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CN', 231, 68966682, 31)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CB', 49707, 65020665, 32)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CB', 5086, 65020665, 33)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CB', 909, 65020665, 34)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CB', 231, 65020665, 35)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GT', 49707, 42016510, 36)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GT', 5086, 42016510, 37)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'GT', 909, 42016510, 38)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CR', 49707, 37116544, 39)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CR', 5086, 37116544, 40)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CR', 909, 37116544, 41)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'CR', 231, 37116544, 42)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'SV', 49707, 31103322, 43)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'SV', 5086, 31103322, 44)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'SV', 909, 31103322, 45)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'NI', 49707, 17415843, 46)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'NI', 5086, 17415843, 47)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'NI', 909, 17415843, 48)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'HN', 49707, 12516273, 49)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'HN', 5086, 12516273, 50)

GO

INSERT [dbo].[test1] ([Country], [grpid], [Value], [Row_number]) VALUES (N'HN', 909, 12516273, 51)

GO

Result:

-Sajid