本文介绍了根据一列的最小值选择行的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要在 MSSQL DB 中选择 A 列具有不同值且 Order 列具有最小值的行.
I need to select row with distinct value of column A and with minimal value of Order column in MSSQL DB.
每条记录的右侧都有更多列.我知道我应该使用 GROUP BY，但是当我想保留右侧列时它确实会发出警告.
Each record has more columns on the right hand side. I know I should used GROUP BY, but it does throw warnings, when I want to keep the right hand side columns a well.
数据集示例:
A | Order | Multiple columns ... |
--------+-------+-------------------------+
A1 | 3 | ... |
A1 | 7 | ... |
A2 | 2 | ... |
A3 | 2 | ... |
A3 | 8 | ... |
所以我想得到这些结果:
So that I want to get these results:
A | Order | Multiple columns ... |
--------+-------+-------------------------+
A1 | 3 | ... |
A2 | 2 | ... |
A3 | 2 | ... |
我尝试使用并抛出警告的查询是这样的:
The query I tried to use and throws warning is this one:
SELECT A, MIN(Order), Column B, Column C, Column D...
FROM Table
GROUP BY A
ORDER BY A
推荐答案
你也可以使用 top (1) with ties
select top (1) with ties a, *
from table t
order by row_number() over (partition by a order by [Order])
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