在一个时间范围内分为5分钟间隔
我在使用mySQL命令时遇到一些困难。
SELECT a.timestamp, name, count(b.name) FROM time a, id b WHERE a.user = b.user AND a.id = b.id AND b.name = 'John' AND a.timestamp BETWEEN '2010-11-16 10:30:00' AND '2010-11-16 11:00:00' GROUP BY a.timestamp 这是我当前的输出语句。
timestamp name count(b.name)
2010-11-16 10:32:22 John 2 2010-11-16 10:35:12 John 7 2010-11-16 10:36:34 John 1 2010-11-16 10:37:45 John 2 2010-11-16 10:48:26 John 8 2010-11-16 10:55:00 John 9 2010-11-16 10:58:08 John 2 如何将它们分为5分钟间隔结果？
我希望我的输出像
timestamp name count(b.name)
2010-11-16 10:30:00 John 2 2010-11-16 10:35:00 John 10 2010-11-16 10:40:00 John 0 2010-11-16 10:45:00 John 8 2010-11-16 10:50:00 John 0 2010-11-16 10:55:00 John 11
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这适用于每个间隔。
PostgreSQL的
SELECT TIMESTAMP WITH TIME ZONE 'epoch' + INTERVAL '1 second' * round(extract('epoch' from timestamp) / 300) * 300 as timestamp, name, count(b.name) FROM time a, id WHERE … GROUP BY round(extract('epoch' from timestamp) / 300), name
的MySQL
SELECT timestamp, -- not sure about that name, count(b.name) FROM time a, id WHERE … GROUP BY UNIX_TIMESTAMP(timestamp) DIV 300, name来源：stack overflow
2020-05-10 22:30:56赞同 展开评论