sql从几个相同的值中选择一个

Question

我有执行查询的结果。它从多个表中收集数据。他是这样的：

|Name|date       |number|Id 
|alex|01-01-2021 |1111  | 1
|mike|01-01-2021 |2222  | 2
|alex|02-01-2021 |1111  | 3
|alex|03-01-2021 |1111  | 4
|john|04-01-2021 |3333  | 5

我需要得到以下结果：

|Name|date      |number| Id 
|mike|01-01-2021|2222  | 2
|alex|any value |1111  | Any value
|john|04-01-2021|3333  | 5

我需要 select 重复值之一并显示 it.I 有一个包含许多列的大型查询。这里我只给出了一个简短的版本来说明问题的本质

Answer 1

select Name,max(date) as date,number
from atable
group by Name, number

Answer 2

您可以使用此 CTE 并管理您将获得的日期（第一个或最后一个）

WITH data AS (
SELECT
  Name, 
  date, 
  number,
  row_number() OVER (PARTITION BY Name ORDER BY date) AS row_num
FROM test01
)
SELECT 
  Name, 
  date, 
  number
FROM data
WHERE row_num = 1

sql从几个相同的值中选择一个

sql selection of one value from several identical

sql-server

sql-server-2014