Grafana group series

Question

I have postgres table with three variables: datetime, robot_id and energy_percent. Now at chart I have energy_percent and robot_id. How to group records from this table by robot_id ? Currently at this table I have records with 3 different robot_id, so I want see 3 lines on this chart.

Edit: I have one table with a lot records, at column robot_id I have ids. I need one line chart per one unique robot_id. If table contains x uniquerobot_id I expect x lines on chart. Here is sample at excel: on left is wrong chart, at right is correct chart: And moreover one thing: on excel where is no data I have 0, but I need no point.

Edit2: I can do it with a lot of series as below, but it should be universal (idk how many unique robot_id will be) and done with one Query (A) not a lot of queries (A,B,C, etc.)

Edit 3: When I apply code:

SELECT
  $__timeGroupAlias(time_created, $__interval),
  robot_id AS "metric",
  AVG(energy_percent) AS "value"
FROM api_robotlog
WHERE
  $__timeFilter(time_created)
GROUP BY 1,2
ORDER BY 1

I have 2 plots: energy_percent(time) and robot_id(time). There is no a lot of plots energy_percent(time, robot_id).

Edit 5: Using @Jan Garaj solution it working. Two charts, with two similar queries: TOP chart query:

SELECT
  $__timeGroupAlias(time_created, $__interval),
  robot_id AS "metric",
  AVG(energy_percent) AS "value"
FROM api_robotlog
WHERE
  $__timeFilter(time_created)
GROUP BY 1,2
ORDER BY 1

BOTTOM chart query:

SELECT
  $__timeGroupAlias(time_created, $__interval),
  robot_id::varchar AS "metric",
  AVG(energy_percent) AS "value"
FROM api_robotlog
WHERE
  $__timeFilter(time_created)
GROUP BY 1,2
ORDER BY 1

Answer 1

Just group it properly. I would switch to text edit more and write SQL manually. For example:

SELECT
  $__timeGroupAlias(time_created, $__interval),
  robot_id AS "metric",
  AVG(energy_percent) AS "value"
FROM api_robotlog
WHERE
  $__timeFilter(time_created)
GROUP BY 1,2
ORDER BY 1