我正在尝试创建CQ并保留标签。
我的数据看起来像这样；值是浮点数，然后有很多标签。
select * from single_measurements order by time desc limit 10
name: single_measurements
time clientId machineId sensorGroupId sensorId typeId value
---- -------- --------- ------------- -------- ------ -----
2019-02-01T22:19:03.155Z 8219 31 31 1003 1 -5728.96875
2019-02-01T22:19:03.155Z 8219 31 31 1002 1 5435.63525390625
2019-02-01T22:19:03.155Z 8219 31 31 1001 1 1859.4556884765625
2019-02-01T22:19:03.155Z 8219 31 31 1000 1 13231.85546875
2019-02-01T22:19:02.155Z 8219 31 31 1003 1 -5728.91943359375
2019-02-01T22:19:02.155Z 8219 31 31 1002 1 5435.68115234375
2019-02-01T22:19:02.155Z 8219 31 31 1001 1 1859.562744140625
2019-02-01T22:19:02.155Z 8219 31 31 1000 1 13232.0205078125
2019-02-01T22:19:01.155Z 8219 31 31 1003 1 -5728.92138671875
2019-02-01T22:19:01.155Z 8219 31 31 1002 1 5435.7177734375
1）我正在创建政策：
create retention policy "a_year" on "mydb" duration 52w replication 1
2）创建CQ
create continuous query "cq_15s" on "mydb"
BEGIN SELECT mean(*) into "a_year"."downsampled_value" from "single_measurements" GROUP BY time(15s),*
end
3）等待15秒并运行此查询
select * from "a_year"."downsampled_value" limit 10
结果为空。我还意识到我可以写错测量名称，也不会出错。
顺便说一句...。这给了我一个非空的结果：
SELECT mean(*) FROM single_measurements GROUP BY time(15s),*
环境：
Connected to http://localhost:8086 version 1.6.4
InfluxDB shell version: 1.6.4
显示连续查询：
name: _internal
name query
---- -----
name: ketag
name query
---- -----
cq_15s CREATE CONTINUOUS QUERY cq_15s ON ketag BEGIN SELECT mean(*) INTO ketag.a_year.downsampled_value FROM ketag.autogen.single_measurements GROUP BY time(15s), * END
cq_15s2 CREATE CONTINUOUS QUERY cq_15s2 ON ketag BEGIN SELECT mean(*) INTO ketag.a_year.downsampled_value2 FROM ketag.autogen.single_measurements GROUP BY time(15s) END