T-SQL 重新排列 1...n 的值

Question

我需要重新排列排名数字，目前它们有 1、12、13、20 等差距，我需要从 1、2、3、4

重新排列

在我的解决方案之后，它正在重新排列，但我相信必须有很多更短的版本来重新排列。

这是我尝试过的：

if object_id('tempdb..#rank') is not null drop table #rank
if object_id('tempdb..#rank2') is not null drop table #rank2

select driver_id, zone_name, zone_rank, 0 as updated into #rank from driver_login where zone_name = 'Out of Zone' order by zone_rank 
select * into #rank2 from #rank

select * from #rank2 order by zone_rank

declare @currentRank int
declare @driverId int

while exists(select 1 from #rank2)
begin
    set @currentRank = (select min(zone_rank) from #rank2)
    set @driverId = (select driver_id from #rank2 where zone_rank = @currentRank)

    if(@currentRank != 1 and exists(select 1 from #rank where zone_rank = 1))
    begin
     declare @minRank int = (select max(zone_rank) from #rank where updated = 1)
     update #rank set zone_rank = @minRank + 1, updated = 1 where driver_id = @driverId
    end
    else if(@currentRank != 1 and not exists(select 1 from #rank where zone_rank = 1))
    begin
     update #rank set zone_Rank = 1, updated = 1 where driver_id = @driverId
    end


    delete from #rank2 where driver_id = @driverId
end

select * from #rank order by zone_rank

这是我的代码的输出：

Answer 1

从 SQL Server 2008 开始，您可以使用 ranking functions 和以下语句之一：

-- Table
CREATE TABLE driver_login (
   driver_id int, 
   zone_name varchar(20), 
   zone_rank int
)
INSERT INTO driver_login
   (driver_id, zone_name, zone_rank)
VALUES
   (100, 'Out of Zone', 5),
   (113, 'Out of Zone', 10),
   (101, 'Out of Zone', 12),
   (114, 'Out of Zone', 13)

-- SELECT statement
SELECT 
   driver_id, 
   zone_name, 
   RANK() OVER (PARTITION BY zone_name ORDER BY zone_rank) zone_rank, 
   1 as updated 
INTO #rank 
FROM driver_login
WHERE zone_name = 'Out of Zone' 

SELECT *
FROM #rank

-- UPDATE statement
;WITH UpdateCTE AS (
   SELECT 
      driver_id, 
      zone_name,
      zone_rank,
      RANK() OVER (PARTITION BY zone_name ORDER BY zone_rank) AS RankID
   FROM driver_login
   WHERE zone_name = 'Out of Zone' 
) 
UPDATE UpdateCTE
SET zone_rank = RankID

SELECT *
FROM driver_login

Answer 2

尝试使用 RANK 函数：

Returns the rank of each row within the partition of a result set. The rank of a row is one plus the number of ranks that come before the row in question.

ROW_NUMBER and RANK are similar. ROW_NUMBER numbers all rows sequentially (for example 1, 2, 3, 4, 5). RANK provides the same numeric value for ties (for example 1, 2, 2, 4, 5).

你会得到这样的东西：

WITH CTE AS
(
    SELECT driver_id,
        RANK() OVER(ORDER BY driver_id) AS RN
    FROM #rank
)
UPDATE #rank
SET zone_rank = RN
FROM #rank INNER JOIN
    CTE ON YourTable.driver_id = CTE.driver_id

Answer 3

使用可更新的 CTE：

with toupdate as (
      select dl.*,
             row_number() over (order by zone_rank) as new_zone_rank
      from driver_login dl
     )
    set zone_rank = new_zone_rank,
        updated = 1
    where zone_rank <> new_zone_rank;

T-SQL 重新排列 1...n 的值

T-SQL Rearrange the values from 1...n

sql

sql-server

sql-server-2008-r2