Crear una tabla en sql server

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Clases]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Clases]
GO

CREATE TABLE [dbo].[Clases] (
[ID_Clase] [int] IDENTITY (1, 1) NOT NULL ,
[id_Curso] [int] NULL ,
[ID_Departamento] [int] NOT NULL ,
[Fecha_Inicio] [datetime] NULL ,
[Fecha_Fin] [datetime] NULL ,
[Localidad] [varchar] (100)
COLLATE SQL_Latin1_General_CP1_CI_AS NULL ) ON [PRIMARY]
GO