在论坛中出现的比较难的sql问题：3(row_number函数 分组查询)

原文:在论坛中出现的比较难的sql问题：3(row_number函数 分组查询)

最近，在论坛中，遇到了不少比较难的sql问题，虽然自己都能解决，但发现过几天后，就记不起来了，也忘记解决的方法了。

所以，觉得有必要记录下来，这样以后再次碰到这类问题，也能从中获取解答的思路。另外，考虑到前2篇太长，看起来不太方便，所以拆分为第3篇

1、分组查询问题

http://bbs.csdn.net/topics/390619682?page=1#post-395835328

例子表结构数据如下：

id status date        price

1  1      2013-10-01  218

2  1      2013-10-02  218

3  0      2013-10-03  218

4  0      2013-10-04  238

5  0      2013-10-05  238

6  0      2013-10-06  238

7  0      2013-10-07  258

8  0      2013-10-08  258

9  0      2013-10-09  218

想获取的结果集一：

2013-10-01至2013-10-03  218

2013-10-04至2013-10-06  238

2013-10-07至2013-10-08  258
2013-10-09至2013-10-09  218

想获取的结果集二：

1  2013-10-01至2013-10-02  218

0  2013-10-03至2013-10-03  218

0  2013-10-04至2013-10-06  238

0  2013-10-07至2013-10-08  258

0  2013-10-09至2013-10-09  218

我的解法：

--drop table tb





 





create table tb(id int,status int,date varchar(10),price int)





 





insert into tb





select 1,  1,      '2013-10-01',  218 union all





select 2,  1,      '2013-10-02',  218 union all





select 3,  0,      '2013-10-03',  218 union all





select 4,  0,      '2013-10-04',  238 union all





select 5,  0,      '2013-10-05',  238 union all





select 6,  0,      '2013-10-06',  238 union all





select 7,  0,      '2013-10-07',  258 union all





select 8,  0,      '2013-10-08',  258 union all





select 9,  0,      '2013-10-09',  218 --union all





--select 10,  0,      '2013-10-10',  218 





go





 





 





 





--第一个结果集





;with t





as





(





select *,





       row_number() over(partition by price order by id) as rownum,





       min(id) over(partition by price) as min_id





from tb 





),





 





tt





as





(





select id,





       price,





       a.date,





       rownum - (id - min_id) as interval





from t a 





)





 





select min(date) + '至' + max(date) as date,





       price





from tt





group by price,interval





order by 1





/*





date	                price





2013-10-01至2013-10-03	218





2013-10-04至2013-10-06	238





2013-10-07至2013-10-08	258





2013-10-09至2013-10-09	218





*/





 





 





--第2个结果集





;with t





as





(





select *,





       row_number() over(partition by status,price order by id) as rownum,





       min(id) over(partition by status,price) as min_id





from tb 





),





 





tt





as





(





select id,





       price,





       a.date,





       a.status,





       rownum - (id - min_id) as interval





from t a 





)





 





select status,min(date) + '至' + max(date),price





from tt





group by status,price,interval





order by 2





/*





status date	                    price





1	   2013-10-01至2013-10-02	218





0	   2013-10-03至2013-10-03	218





0	   2013-10-04至2013-10-06	238





0	   2013-10-07至2013-10-08	258





0	   2013-10-09至2013-10-09	218





*/

2、查询出一段数据后判断记录里面的最大id,是否大于值a 查询语句如下：
http://bbs.csdn.net/topics/390619191

select top 200 id, ClassId,Name,Price,BoxContain,BoxLength,BoxWidth,BoxHeight,CName,EName,CPack,PhotoFolder,EPack,0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08 from ProductData where ClassId=101 and BoxContain >0 and BoxContain is not null and round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) >=0 And round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) <= 10000 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) >=10 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) <=1000 and EPack='Window Box' order by id asc

我的解法，适用于SQL Server 2000：

select *





from 





(





select top 200 id, ClassId,Name,Price,BoxContain,BoxLength,BoxWidth,BoxHeight,CName,EName,CPack,PhotoFolder,EPack,





0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08 





from ProductData 





where ClassId=101 and BoxContain >0 and BoxContain is not null 





and round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) >=0





 And round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) <= 10000 





 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) >=10 





 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) <=1000 





 and EPack='Window Box' 





order by id asc





)t





where





(





	select max(id) 





    from





	(





	select top 200 id, ClassId,Name,Price,BoxContain,BoxLength,BoxWidth,BoxHeight,CName,EName,CPack,PhotoFolder,EPack,





	0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08 





	from ProductData 





	where ClassId=101 and BoxContain >0 and BoxContain is not null 





	and round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) >=0





	 And round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3) <= 10000 





	 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) >=10 





	 and (0.46*(round(((convert(decimal(10,2),BoxLength)*convert(decimal(10,2),BoxWidth) * convert(decimal(10,2),BoxHeight))/1000000),3))*35.32/BoxContain+Price/6*1.08) <=1000 





	 and EPack='Window Box' 





         order by id asc





	)t





) > a

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