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sql - 如何使用 MySQL 进行分组和计数

转载 作者:行者123 更新时间:2023-11-29 06:23:36 24 4
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我的数据如下所示:

ID  post_author post_title  guid3309    21  Should somebody not yet on SQL 2008 wait for SQL 2008 R2, since it's near release?  http://sql.stackexchange.com/questions/379/should-somebody-not-yet-on-sql-2008-wait-for-sql-2008-r2-since-its-near-release1695    429 How do we politely decline well meaning advice from the Grandmother?    http://moms4mom.stackexchange.com/questions/1208/how-do-we-politely-decline-well-meaning-advice-from-the-grandmother556 173 Books on how to be a great dad  http://moms4mom.stackexchange.com/questions/1042/books-on-how-to-be-a-great-dad160 30  Building an ice hockey net cam  http://photo.stackexchange.com/questions/8/building-an-ice-hockey-net-cam159 30  Generic commercial photo release form   http://photo.stackexchange.com/questions/4/generic-commercial-photo-release-form

我需要创建一个查询,对 GUID 字段(根 URL)的一部分数据进行分组,并对每个字段的 POST_AUTHOR 进行计数。

我正在寻找的结果是这样的:

Site    Count of Authorshttp://sql.stackexchange.com    1http://moms4mom.stackexchange.com   2http://photo.stackexchange.com  2

如果有人帮助我构建 SQL,我将不胜感激。

最佳答案

SELECT COUNT(POST_AUTHOR) AS AUTHOR_COUNT, GUID FROM TABLE_NAME GROUP BY GUID

关于sql - 如何使用 MySQL 进行分组和计数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1589834/

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