选择具有随机ID的不同两列

Question

我希望获得每个设计的明确记录，并使用每个记录的随机ID输入它是不可能使用的

select distinct Design, Type, ID from table

它将返回所有值这是我的表的结构

Design | Type | ID
old chair 1
old table 2
old chair 3
new chair 4
new table 5
new table 6
newest chair 7

可能的结果

Design | Type | ID
old table 2
old chair 3
new chair 4
new table 6
newest chair 7

Answer 1

如果哪个无关紧要，你可以随时取最大\\最小值：

SELECT design,type,max(ID)
FROM YourTable
GROUP BY design,type

这不会是随机的，它总是需要最大的\\最小值，但似乎并不重要。

Answer 2

试试这个：

select *
from (
select *, row_number() over (partition by Design,Type order by id desc) rowID
from @tab
) x
where rowID = 1

Answer 3

希望这个可以帮助你：

WITH CTE AS
(
    SELECT Design, Type, ID, ROW_NUMBER() OVER (PARTITION BY Design, 
                                                   Type ORDER BY id DESC) rid
    FROM table
)
SELECT Design, Type, ID FROM CTE WHERE rid = 1 ORDER BY ID