問(wèn)題描述
在 SQL Server 2008 R2 上，我想為另一列的每個(gè)不同值選擇一列的一個(gè)值.
On SQL server 2008 R2, I would like to select one value of a column for each distinct value of another column.
例如
name id_num
Tom 53
Tom 60
Tom 27
Jane 16
Jane 16
Bill 97
Bill 83
我需要為每個(gè)不同的名稱獲取一個(gè) id_num，例如
I need to get one id_num for each distinct name, such as
name id_num
Tom 27
Jane 16
Bill 97
對(duì)于每個(gè)名稱，可以隨機(jī)選取 id_num(不需要是 max 或 min)，只要與名稱相關(guān)聯(lián)即可.
For each name, the id_num can be randomly picked up (not required to be max or min) as long as it is associated with the name.
例如，對(duì)于比爾，我可以選擇 97 或 83.任何一個(gè)都可以.
For example, for Bill, I can pick up 97 or 83. Either one is ok.
我知道如何編寫 SQL 查詢.
I do know how to write the SQL query.
謝謝
推薦答案
SELECT
name,MIN(id_num)
FROM YourTable
GROUP BY name
更新:如果你想隨機(jī)選擇 id_num，你可以試試這個(gè)
UPDATE: If you want pick id_num randomly, you may try this
WITH cte AS (
SELECT
name, id_num,rn = ROW_NUMBER() OVER (PARTITION BY name ORDER BY newid())
FROM YourTable
)
SELECT *
FROM cte
WHERE rn = 1
SQL 小提琴演示
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