本文介绍了MySQL - 获取最低值的处理方法,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跟版网的小编来一起学习吧!
问题描述
我的数据库结构包含列:id、name、value、dealer
.我想为 每个 dealer
检索具有最低 value
的行.我一直在尝试使用 MIN()
和 GROUP BY
,但仍然没有解决方案.
My database structure contains columns: id, name, value, dealer
. I want to retrieve row with lowest value
for each dealer
. I've been trying to mess up with MIN()
and GROUP BY
, still - no solution.
推荐答案
Solution1:
SELECT t1.* FROM your_table t1
JOIN (
SELECT MIN(value) AS min_value, dealer
FROM your_table
GROUP BY dealer
) AS t2 ON t1.dealer = t2.dealer AND t1.value = t2.min_value
解决方案 2:
SELECT t1.* FROM your_table t1
LEFT JOIN your_table t2
ON t1.dealer = t2.dealer AND t1.value > t2.value
WHERE t2.value IS NULL
这个问题非常有名,所以在Mysql的手册中有专门的页面.
This problem is very famous, so there is a special page for this in Mysql's manual.
检查:行保持某列的分组最大值/最小值
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