利用sql2005的新特性实现根据子表条件得到的主表键且按其排序取出对应主表记录的方法

假如有两个关联表，是一对多关系的主子表。如下：

主表




CREATE TABLE [dbo].[CourseT](


[CourseID] [int] IDENTITY(1,1) NOT NULL,


[CourseName] [nchar](10) COLLATE Chinese_PRC_CI_AS_WS NULL


) ON [PRIMARY]



字表


CREATE TABLE [dbo].[Broad](


[BroadID] [int] IDENTITY(1,1) NOT NULL,


[CourseID] [int] NULL,


[BroadName] [nvarchar](50) COLLATE Chinese_PRC_CI_AS_WS NULL


) ON [PRIMARY]



如果我们想查询Broad表中记录对应的CourseT表中的记录，且按CourseID的降序只取一次，在SQL2005中SQL如下


with temp as


(


select distinct courseid from Broad


),


temp2 as


(


select courseid , ROW_NUMBER() OVER(ORDER BY courseid desc) AS row_num


from temp


)


select CourseT.* from CourseT, temp2 where courset.courseid=temp2.courseid order by row_num