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

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