我有 NAME 和 PAY,但在此示例中我需要 CHANGEGROUP:
NAME PAY DATE CHANGEGROUP
Sally 12 10/01/2011 1
Sally 12 10/01/2011 1
Sally 12 11/02/2011 1
Sally 12 11/02/2011 1
Sally 12 12/01/2012 1
Sally 13 04/23/2013 2
Sally 12 04/24/2013 3
Sally 10 05/01/2013 4
Sally 10 10/01/2014 4
我尝试了 RANK()
和 DENSE_RANK()
,但它们根据值进行分组 - 因为工资下降,它打乱了我的分组。我看到this但它与旧版本的 SQL 2005 不兼容
最佳答案
这是一个间隙和岛屿问题。
一种方法。 SQL Fiddle
WITH T1
AS (SELECT *,
ROW_NUMBER()
OVER (
PARTITION BY NAME
ORDER BY DATE) - ROW_NUMBER()
OVER (
PARTITION BY NAME, [PAY]
ORDER BY DATE) AS Grp
FROM Table1),
T2
AS (SELECT *,
MIN(DATE)
OVER (
PARTITION BY NAME, Grp) AS MinDate
FROM T1)
SELECT [NAME],
[PAY],
[DATE],
DENSE_RANK()
OVER (
PARTITION BY NAME
ORDER BY MinDate) AS CHANGEGROUP
FROM T2
ORDER BY NAME,
MinDate
关于sql - 更改号码栏,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26414603/