问题描述
我正在使用 Telegraf Openweathermap 插件 (https://github.com/influxdata/telegraf/tree/master/plugins/inputs/openweathermap) 来收集天气预报并将它们存储在 Influxdb 中。然后我想在 Grafana 中显示这些。
据我所知，Telegraf 插件会定期运行（默认为 10 分钟），并以 3 小时为增量收集未来最多 120 小时的天气预报。它为每个预测分配一个“预测”变量，该变量是预测生效前的小时数。由于插件定期运行，同一时间段将应用多个预测，从未来 120 小时到未来 3 小时。
因此，单个时间戳最多可以分配 40 个预测。我想从现在开始获取最新的预测，以便我可以显示它们。
influx -precision rfc3339 -database "telegraf" -execute "select * from weather where time > Now() group by time(1ms)"
然而，这给了我：
ERR: GROUP BY requires at least one aggregate function
GROUP BY requires at least one aggregate function
如何获得最近的预测列表？
我在下面的数据库中显示了最后 20 个项目以显示我尝试查询的数据：
name: weather
time city city_id cloudiness condition_description condition_icon condition_id condition_main country forecast host humidity pressure rain sunrise sunset temperature visibility wind_degrees wind_speed
---- ---- ------- ---------- --------------------- -------------- ------------ -------------- ------- -------- ---- -------- -------- ---- ------- ------ ----------- ---------- ------------ ----------
2020-12-29T21:00:00Z Liverpool 2644210 11 few clouds 02n 801 Clouds GB 36h xxxxxxxxxxxxxxxxxxxxxxx 72 998 0 4.5 329 5.19
2020-12-29T21:00:00Z Liverpool 2644210 11 few clouds 02n 801 Clouds GB 39h xxxxxxxxxxxxxxxxxxxxxxx 72 998 0 4.5 329 5.19
2020-12-29T21:00:00Z Liverpool 2644210 18 few clouds 02n 801 Clouds GB 42h xxxxxxxxxxxxxxxxxxxxxxx 74 997 0 4.06 323 4.25
2020-12-29T21:00:00Z Liverpool 2644210 18 few clouds 02n 801 Clouds GB 45h xxxxxxxxxxxxxxxxxxxxxxx 74 997 0 4.06 323 4.25
2020-12-29T21:00:00Z Liverpool 2644210 18 few clouds 02n 801 Clouds GB 48h xxxxxxxxxxxxxxxxxxxxxxx 74 997 0 4.06 323 4.25
2020-12-29T21:00:00Z Liverpool 2644210 21 few clouds 02n 801 Clouds GB 51h xxxxxxxxxxxxxxxxxxxxxxx 84 995 0 2.35 276 2.03
2020-12-29T21:00:00Z Liverpool 2644210 21 few clouds 02n 801 Clouds GB 54h xxxxxxxxxxxxxxxxxxxxxxx 84 995 0 2.35 276 2.03
2020-12-29T21:00:00Z Liverpool 2644210 21 few clouds 02n 801 Clouds GB 57h xxxxxxxxxxxxxxxxxxxxxxx 84 995 0 2.35 276 2.03
2020-12-29T21:00:00Z Liverpool 2644210 2 clear sky 01n 800 Clear GB 24h xxxxxxxxxxxxxxxxxxxxxxx 82 999 0 4.12 332 4.95
2020-12-29T21:00:00Z Liverpool 2644210 2 clear sky 01n 800 Clear GB 27h xxxxxxxxxxxxxxxxxxxxxxx 82 999 0 4.12 332 4.95
2020-12-29T21:00:00Z Liverpool 2644210 2 clear sky 01n 800 Clear GB 30h xxxxxxxxxxxxxxxxxxxxxxx 82 999 0 4.12 332 4.95
2020-12-29T21:00:00Z Liverpool 2644210 0 clear sky 01n 800 Clear GB 33h xxxxxxxxxxxxxxxxxxxxxxx 73 998 0 4.42 328 5.2
2020-12-29T21:00:00Z Liverpool 2644210 0 clear sky 01n 800 Clear GB 36h xxxxxxxxxxxxxxxxxxxxxxx 73 998 0 4.42 328 5.2
2020-12-29T21:00:00Z Liverpool 2644210 28 scattered clouds 03n 802 Clouds GB 48h xxxxxxxxxxxxxxxxxxxxxxx 85 995 0 2.43 303 1.26
2020-12-29T21:00:00Z Liverpool 2644210 28 scattered clouds 03n 802 Clouds GB 51h xxxxxxxxxxxxxxxxxxxxxxx 85 995 0 2.43 303 1.26
2020-12-30T00:00:00Z Liverpool 2644210 11 few clouds 02n 801 Clouds GB 27h xxxxxxxxxxxxxxxxxxxxxxx 79 1000 0 3.79 336 4.46
2020-12-30T00:00:00Z Liverpool 2644210 11 few clouds 02n 801 Clouds GB 30h xxxxxxxxxxxxxxxxxxxxxxx 79 1000 0 3.79 336 4.46
2020-12-30T00:00:00Z Liverpool 2644210 11 few clouds 02n 801 Clouds GB 33h xxxxxxxxxxxxxxxxxxxxxxx 79 1000 0 3.79 336 4.46
2020-12-30T00:00:00Z Liverpool 2644210 12 few clouds 02n 801 Clouds GB 45h xxxxxxxxxxxxxxxxxxxxxxx 80 998 0 4.53 327 5.16
2020-12-30T00:00:00Z Liverpool 2644210 12 few clouds 02n 801 Clouds GB 48h xxxxxxxxxxxxxxxxxxxxxxx 80 998 0 4.53 327 5.16
解决方法
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