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 shopId order by createTime desc), * from Goods_info

标签：desc   git   add   const   分组   部门   employee   包含   pen   

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

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 shopId order by createTime desc), * from Goods_info

标签：desc   git   add   const   分组   部门   employee   包含   pen   

原文地址：http://www.cnblogs.com/blogzys/p/7039466.html