différence de table

Bonjour,

Quelqu'un saurait exactement la différence entre

Code:

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GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[history]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[history](
	[id] [varchar](255) NOT NULL,
	[fileName] [varchar](100) NULL,
	[status] [varchar](20) NULL,
	[updated] [datetime] NULL,
	[updatedBy] [varchar](100) NULL
) ON [PRIMARY]
END
GO

Code:

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GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[history]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[history](
	[id] [varchar](255) NOT NULL,
	[fileName] [varchar](100) NULL,
	[status] [varchar](20) NULL,
	[updated] [datetime] NULL,
	[updatedBy] [varchar](100) NULL,
PRIMARY KEY CLUSTERED 
(
	[id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END

Je suis un peu perdu par rapport à tout ce que j'ai pu lire :-s