title: Extraing individual field values from an InfluxDB database
body: <p>My apologies if this is a trivial question. I am capturing data from a BMP280 temperature/pressure sensor and publishing it via MQTT. Using Node Red, I am formatting the data into payloads like <code>&quot;BMP2801 temp=23.57,pres=1013.8&quot;</code> and storing it in an influxdb on Raspberry Pi. The queries shown in the image below seem to indicate that I am storing successfully - though possibly not in the right format for retrieval.</p>
  <p><img src="https://i.stack.imgur.com/DPAzZ.png" alt="Database content - as stored" /></p>
  <p>My question is how to frame a select statement to retrieve a series of temperature values that can be fed  to a chart in the Node Red dashboard.  Alternatively, if I am storing the data incorrectly, how should the messages feeding the data to influxdb be formatted? Any tips would be appreciated!</p>