sql - sql改变列顺序

Question

如何使用sql server 2005将列中的旧序列更改为新序列

old new
   1   1
   1   1
   3   2
   4   3
   5   4
   5   4
   5   4
   8   5
   8   5
   10  6

Answer 1

我想你正在寻找dense_rank：

select dense_rank() over (order by old) rn, old
from yourtable
order by old

• SQL 小提琴演示

Answer 2

你在寻找DENSE_RANK ()

SELECT
    T.*
    ,DENSE_RANK() OVER (ORDER BY T.Old) As New
FROM Table1 T

小提琴演示

Answer 3

使用不带子句的窗口函数：dense_rank()PARTITION

SELECT old, dense_rank() OVER (ORDER BY old) AS new
FROM   tbl;