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    3. MySQL - 获取最低值

      MySQL - Fetching lowest value(MySQL - 获取最低值)

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                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()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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