当前用户ID位于中心的排行榜榜首-SQL查询

我有下表：

+---------+------------+----------+-------+
| userId  | campaignId | countryId| points| 
+---------+------------+----------+-------+
|      10 | 1          |      101 |    72 |
|       3 | 1          |      101 |    30 |
|       6 | 1          |      101 |    72 |
|       4 | 1          |      101 |    49 |
|       1 | 1          |      101 |    53 |
|       8 | 1          |      101 |    67 |
|       5 | 1          |      101 |     6 |
|       7 | 1          |      101 |    87 |
|       2 | 1          |      101 |    41 |
|      11 | 1          |      101 |    76 |
|       9 | 1          |      101 |    50 |
+---------+------------+----------+-------+

我已经创建了一个排行榜榜首列表，其查询如下：

    select 
       RANK() OVER(order by T.points desc) AS rowRank,
          T.UserID, T.points
        from table as T 
        where T.campaignId=@campaignId
OFFSET (@page-1)*@limit ROWS FETCH NEXT @limit ROWS ONLY

上面的查询从上到下返回一个常规的toplist

但是，下一个要求是创建一个排行榜toplist，返回当前用户Id排名+上面的2个排名用户+下面的2个排名用户，总共5个用户应与当前用户一起列在中心

因此，其他输入参数应为：

set @userId = 8 // current user where leader board should center around
set @maxTopLimit = 2 // include 2 users ranked above current user
set @maxBottomLimit = 2 // include 2 users ranked below current user

返回的排行榜应该是这样的，中间有userId8

        +---------+------------+----------+-------+---------|
        | userId  | campaignId | countryId| points| rowRank |
        +---------+------------+----------+-------+---------+
        |      11 | 1          |      101 |    76 |   3     |
        |      10 | 1          |      101 |    72 |   4     |
   #####|###### 8 | 1 #########|##### 101 |### 67 |## 5 ####|########
        |       9 | 1          |      101 |    50 |   6     |
        |       2 | 1          |      101 |    49 |   7     |
        +---------+------------+----------+-------+------+--+

如何编写这样的SQL查询

在子查询或公共表表达式中移动排名结果。

的cte\u排名为（…）

选择目标用户。

来自cte\u排名cr，其中cr.UserId=@UserId

将目标行与定义间隔内的所有行联接。

加入cr2.RowRank>=cr.RowRank-@before和cr2.RowRank上的cte_秩cr2
在子查询或公共表表达式中移动排名结果。

的cte\u排名为（…）
选择目标用户。

来自cte\u排名cr，其中cr.UserId=@UserId
将目标行与定义间隔内的所有行联接。

加入cr2.RowRank>=cr.RowRank-@before和cr2.RowRank上的cte_秩cr2
create table CampaignPoints
(
  UserId int,
  CampaignId int,
  CountryId int,
  Points int
);

insert into CampaignPoints (UserId, CampaignId, CountryId, Points) values
(10, 1, 101, 72),
( 3, 1, 101, 30),
( 6, 1, 101, 72),
( 4, 1, 101, 49),
( 1, 1, 101, 53),
( 8, 1, 101, 67),
( 5, 1, 101,  6),
( 7, 1, 101, 87),
( 2, 1, 101, 41),
(11, 1, 101, 76),
( 9, 1, 101, 50);

declare @userId int = 8;
declare @before int = 2;
declare @after  int = 2;

with cte_rank as
(
  select cp.UserId,
         cp.CampaignId,
         cp.CountryId,
         cp.Points,
         rank() over(order by cp.Points desc) as RowRank
  from CampaignPoints cp
)
select cr2.*
from cte_rank cr
join cte_rank cr2
  on  cr2.RowRank >= cr.RowRank - @before
  and cr2.RowRank <= cr.RowRank + @after
where cr.UserId = @userId
order by cr2.RowRank;

UserId  CampaignId  CountryId  Points  RowRank
------  ----------  ---------  ------  ------- 
10      1           101        72      3
 6      1           101        72      3
 8      1           101        67      5
 1      1           101        53      6
 9      1           101        50      7