包括自增主键，varchar，float类型...

if not exists (select * from dbo.sysobjects where id = object_id(N'[dbo].

[task_value]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
CREATE TABLE [dbo].[task_value] (
[task_id] Int IDENTITY primary key NOT NULL ,
[task_name] [varchar] (255) COLLATE Chinese_PRC_CI_AS NULL ,
[task_value] [float] NULL
) ON [PRIMARY]
GO