SQLServer RANK() 排名函数的使用

2022-09-05 17:13_Hey_Jude Sql Server

本文主要介绍了SQLServer RANK() 排名函数的使用，文中根据实例编码详细介绍的十分详尽，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文主要介绍了SQLServer RANK() 排名函数的使用，具体如下：

				?

									-- 例子表数据

									SELECT * FROM test;

									-- 统计分数

									SELECT name,SUM(achievement) achievement FROM test GROUP BY name; 

									-- 按统计分数做排行

									SELECT RANK() OVER( ORDER BY SUM(achievement) desc) 排行,name,SUM(achievement) achievement FROM test GROUP BY name;

求助问答存储过程使用：

				?

									USE [DB]

									GO

									/****** Object:  StoredProcedure [dbo].[sp_TodayJoinUser]    Script Date: 2021/1/26 14:45:24 ******/

									SET ANSI_NULLS ON

									GO

									SET QUOTED_IDENTIFIER ON

									GO

									-- =============================================

									-- Author:      _Hey_Jude

									-- Create date: 2021-01-26

									-- Description: 获取今日发表帮助/回复的新用户

									-- =============================================

									CREATE PROCEDURE [dbo].[sp_TodayJoinUser] 

									    @tableLevel int,

									    @date varchar(30)

									AS

									Declare @Sql nvarchar(max) 

									declare @minTabId int

									declare @maxTabId int

									declare @maxf_id int

									declare @helpTableName nvarchar(max)

									declare @tableCount int

									BEGIN

									     --最小f_id所在表

									     set @minTabId=0

									     set @tableCount=@minTabId

									     --最大f_id所在表

									     set @maxf_id=(select MAX(F_ID) from [Table] where F_IsDelete=0)

									     set @maxTabId=@maxf_id/@tablelevel

									     set @helpTableName='SELECT UserID, Max([F_DateTime]) AS dt FROM [Table] GROUP BY UserID'

									     while @tableCount<=@maxTabId

									     begin     

									        print @tableCount

									        set @helpTableName += ' UNION SELECT UserID, Max([DateTime]) as dt FROM SubTable'+cast(@tableCount as nvarchar(10))+' GROUP BY UserID '

									        set @tableCount=@tableCount+1

									     end

									     set @Sql='SELECT [nikename] FROM ( 

									                    SELECT UserID, RANK() OVER(PARTITION BY UserID ORDER BY dt) AS Num,dt FROM ( '+@helpTableName+' ) AS T ) AS NewT

									               LEFT JOIN [UserTable] A WITH(NOLOCK) ON NewT.UserID = A.UserId WHERE Num = 1 AND dt > '''+@date+''''

									     Exec sp_executesql @Sql

									END

									GO

partition的意思是对数据进行分区，sql语句如下

				?

									SELECT* FROM (

									    SELECT

									        ROW_NUMBER() over(partition by [姓名] order by [打卡时间] desc) as rowNum,

									        [姓名],

									        [打卡时间]

									    FROM [dbo].[打卡记录表]

									    ) temp

									WHERE temp.rowNum = 1