SQL Server中的唯一行约束

I have the following table

我有下表

CREATE TABLE [dbo].[LogFiles_Warehouse](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [timestamp] [datetime] NOT NULL,
    [clientNr] [int] NOT NULL,
    [server] [nvarchar](150) COLLATE Latin1_General_CI_AS NOT NULL,
    [storeNr] [int] NOT NULL,
    [account] [nvarchar](50) COLLATE Latin1_General_CI_AS NOT NULL,
    [software] [nvarchar](300) COLLATE Latin1_General_CI_AS NOT NULL,
 CONSTRAINT [PK_Astoria_LogFiles_Warehouse] PRIMARY KEY CLUSTERED 
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
CREATE TABL