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当我有 3 个其他对应列时，如何获得特定对应列的最大值？

[英]How do I get max value for a specific corresponding column when I have 3 other corresponding columns?

原文 2020-05-05 02:54:42 0 1 sql/ greatest-n-per-group

I have 4 columns: URL |我有 4 列： URL | keywords |关键词 | Volume (of keyword) |数量（关键字）| Position (of Keyword) Position（关键字）

is there a way I can pull the max(volume) for the URL?有没有办法可以拉出 URL 的最大（音量）？ I also want to pull in keyword and position column, but I have multiple values per URL, so when I add the other columns I get back more data than I want.我还想提取关键字和 position 列，但是每个 URL 有多个值，所以当我添加其他列时，我得到的数据比我想要的多。

1 个解决方案

Not clear on the question,if you mean that you need maximum volume for a given url while retaining the other columns,here is the code: Select url,keywords,position,(select max(volume) from your_table t1 where t1.url=t.url) From your_table t Not clear on the question,if you mean that you need maximum volume for a given url while retaining the other columns,here is the code: Select url,keywords,position,(select max(volume) from your_table t1 where t1.url= t.url) 来自 your_table t

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在Oracle中，如何找出一/两列数据，其中相应的其他列具有最大值 - In oracle How can I Find out one/two Columns data which corresponding other columns have maximum value

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