分组 根据某一列进行排序，根据shopid分组，用createTime排序，返回row_number()序号 select no =row_number() over (partition by s

Posted 2020-09-23 张彦山

 

over不能单独使用，要和分析函数：rank(),dense_rank(),row_number()等一起使用。
其参数：over（partition by columnname1 order by columnname2）
含义：按columname1指定的字段进行分组排序，或者说按字段columnname1的值进行分组排序。
例如：employees表中，有两个部门的记录：department_id ＝10和20
select department_id，rank（） over（partition by department_id order by salary) from employees就是指在部门10中进行薪水的排名，在部门20中进行薪水排名。如果是partition by org_id，则是在整个公司内进行排名。

以下是个人见解：

sql中的over函数和row_numbert()函数配合使用，可生成行号。可对某一列的值进行排序，对于相同值的数据行进行分组排序。

执行语句：select row_number() over(order by AID DESC) as rowid,* from bb

SELECT
House.HouseId,
House.HouseName,
House.iconFlag,
House.orderId,
House.HouseJingYingFW,
House.HouseTel,
House.HouseCelPhone,
dbo.fnGetDistance(
118.328213, 35.081728, House.longitude,
House.latitude
) as jl,
Goods.originalPrice as levelCount,
Goods.presentPrice as levelAmount
FROM
House
LEFT JOIN (
select shopId,originalPrice,presentPrice
from (select no =row_number() over (partition by shopId order by createTime desc), * from Goods_info WHERE IsClear = 1)t
where no=1
) Goods on shopId = House.HouseId
where
(
House.isdel is null
or House.isdel = 0
)
and House.status = 1
and House.houseStatus <> 0
and House.housetype like ‘%1%‘
order by
House.orderId desc,
jl ASC

 

 

 

IF OBJECT_ID (‘dbo.fnGetDistance‘) IS NOT NULL
DROP FUNCTION dbo.fnGetDistance
GO

--计算地球上两个坐标点（经度，纬度）之间距离sql函数
CREATE FUNCTION [dbo].[fnGetDistance](@LatBegin REAL, @LngBegin REAL, @LatEnd REAL, @LngEnd REAL) RETURNS FLOAT
AS
BEGIN
--距离(千米)
DECLARE @Distance REAL
DECLARE @EARTH_RADIUS REAL
SET @EARTH_RADIUS = 6378.137
DECLARE @RadLatBegin REAL,@RadLatEnd REAL,@RadLatDiff REAL,@RadLngDiff REAL
SET @RadLatBegin = @LatBegin *PI()/180.0
SET @RadLatEnd = @LatEnd *PI()/180.0
SET @RadLatDiff = @RadLatBegin - @RadLatEnd
SET @RadLngDiff = @LngBegin *PI()/180.0 - @LngEnd *PI()/180.0
SET @Distance = 2 *ASIN(SQRT(POWER(SIN(@RadLatDiff/2), 2)+COS(@RadLatBegin)*COS(@RadLatEnd)*POWER(SIN(@RadLngDiff/2), 2)))
SET @Distance = @Distance * @EARTH_RADIUS
--SET @Distance = Round(@Distance * 10000) / 10000
RETURN @Distance
END
GO

 SQL中Group分组获取Top N方法实现

 

有产品表，包含id，name，city，addtime四个字段，因报表需要按城市分组，统计每个城市的最新10个产品，便向该表中插入了100万数据，做了如下系列测试：

  www.2cto.com  

CREATE TABLE [dbo].[products](

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

    [name] [nvarchar](50) NULL,

    [addtime] [datetime] NULL,

    [city] [nvarchar](10) NULL,

 CONSTRAINT [PK_products] PRIMARY KEY CLUSTERED 

(

    [id] ASC

)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]

) ON [PRIMARY]

 

1、采用row_number方法，执行5次，平均下来8秒左右，速度最快。

  www.2cto.com  

select no, id,name,city 

from  (select  no =row_number() over (partition by city order by addtime desc), * from products)t

where no< 11 order by city asc,addtime desc

2、采用cross apply方法，执行了3次，基本都在3分5秒以上，已经很慢了。

 

select distinct b.id,b.name,b.city from products a 

cross apply (select top 10 * from products where city = a.city order by  addtime desc) b

3、采用Count查询，只执行了两次，第一次执行到5分钟时，取消任务执行了；第二次执行到13分钟时，没有hold住又直接停止了，实在无法忍受。

 

select id,name,city from products a 

where (  select count(city) from products where a.city = city and addtime>a.addtime) < 10

order by city asc,addtime desc

4、采用游标方法，这个最后测试的，执行了5次，每次都是10秒完成，感觉还不错。

 

 

declare @city nvarchar(10)

create table #Top(id int,name nvarchar(50),city nvarchar(10),addtime datetime)

declare mycursor cursor for

select  distinct city from products order by city asc

open mycursor

fetch next from mycursor into @city

while @@fetch_status =0

begin

    insert into #Top 

    select top 10 id,name,city,addtime from products where city = @city 

    fetch next from mycursor into @city

end 

close mycursor

deallocate mycursor

Select * from #Top order by city asc,addtime desc

drop table #Top

 

通过上述对比不难发现，在面临Group获取Top N场景时，可以首选row_number，游标cursor其次，另外两个就基本不考虑了，数据量大的时候根本没法使用。