Question

I have started playing around with Influxdb v0.13 and I have some dummy values in my test db where id is a tag and value is a field:

> SELECT * FROM dummy
name: dummy
--------------
time                    id     value
1468276508161069051     1234    12345
1468276539152853428     613     352
1468276543470535110     613     4899
1468276553853436191     1234    12

I get no results returned when I run this query:

> SELECT * FROM dummy WHERE id=1234

but I do get the following when querying with the field instead:

> SELECT * FROM dummy WHERE value=12
name: dummy
--------------
time                    id     value
1468276553853436191     1234    12

Am I doing something wrong here? I thought the point of tags were to be queried (since they are indexed and fields are not), but they seem to break my queries.

Answer 1

看来Influx会将每个标记键和我们插入的值视为字符串，这显然在他们的官方文档中显示。

请参阅：https://docs.influxdata.com/influxdb/v0.13/guides/writing_data/

写入点时，必须在db中指定现有数据库查询参数。请参阅“写入语法”页面上的HTTP部分完整的可用查询参数列表。 POST的正文 - 我们称之为线路协议 - 包含您希望存储的时间序列数据。它们包括测量，标签，字段和a 时间戳。 InfluxDB需要一个测量名称。 严格来说，标签是可选的，但大多数系列都包含用于区分数据的标签来源和使查询既简单又有效。两个标签键和标签值是字符串。

注意：文字用粗体表示。

因此，要按标记键值过滤 - 必须引用查询。

示例：

SELECT * FROM dummy WHERE id='1234'

Query Influxdb based on tags?

1 个答案: