InfluxDB:cannot use field in group by clause
2020-01-15 06:38
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最近在使用InfluxDB时，发现一个很奇怪的问题，一个本来正常的功能，做了一次改动后，就不能正常显示了.
一、查询语句
SELECT MEMORY FROM "ACM_PROCESS_MONITOR" GROUP BY USER_NAME
异常信息如下：
Server returned error: can not use field in GROUP BY clause: USER_NAME
Group By语句后面，只能是Tag列，不能是Field列
二、查看所有Tag列
说明USER_NAME是Tag列
三、查看所有Field列
说明USER_NAME是Field列
综上所述，USER_NAME既是FIELD列，又是TAG列！
四、问题产生原因
产生这个问题的原因，是因为UESER_NAME以前确实是FIELD列：
因为不能在GROUP BY 中查询，于是把它设置为了TAG列：
为了方便，删除了原来的表，数据都是新的，GROUP BY 没有问题。
今天一不小心，又启用了改之前的程序，导致又把USER_NAME作为了FIELD列，所以GROUP BY的时候出问题了。
老外的描述：https://github.com/influxdata/influxdb/issues/3783
解决方案：
1.把表删了重建，然后启用新程序
或：
2.重新为USER_NAME取一个作为TAG列的名字：TAG_USER_NAME，数据都写到这里，用它作为GROUP BY的Tag列
转载于:https://www.cnblogs.com/liugh/p/8128065.html
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