How to filter grafana dashboard with greater than and less than operators?

问题

I'm working on a project where I'm using Grafana and InfluxdB. I was able to get all the required values to grafana.

In my response I have a filed with value less than and greater than zero. I want to add a filter where user can select the type of operation.

Any recommendation on how to crack this.

So far I have tried..

I created a Variable (constant value 0, which i tried to use in my dashboard query with less than or greater than operator. As soon as I select my variable, the operator gets changed to 'equal to' or 'not equal to'.

By providing the value directly in the query works fine.

Query reflected Using the variable which i created as constant

SELECT "servicename" AS "Service Name", "topic" AS "Topic", "type" AS "Type", "count" AS "Count" FROM "KafkaLag" WHERE ("servicename" =~ /^$servicename$/ AND "topic" =~ /^$topic$/ AND "type" =~ /^$type$/ AND "count" =~ /^$Greater_than_zero$/) AND $timeFilter ORDER BY time DESC

Query reflected using value directly without any variable

SELECT "servicename" AS "Service Name", "topic" AS "Topic", "type" AS "Type", "count" AS "Count" FROM "KafkaLag" WHERE ("servicename" =~ /^$servicename$/ AND "topic" =~ /^$topic$/ AND "type" =~ /^$type$/ AND "count" > 0) AND $timeFilter ORDER BY time DESC

From the below table I need a way to put a dynamic filter on field_2 where I can get greater than zero values when required.

time | field_1 | field_2 
  t1 |   v1    |    0 
  t1 |   v2    |    2 
  t2 |   v3    |    0 
  t2 |   v4    |    12

回答1:

select * from <table/measurement name> where field_2 > 0;

This query will filter data as per you need.

回答2:

This may be late answer but this is how I have done it earlier. Create a variable count, type "custom". Then, use that variable as below in query-

SELECT "service_name" FROM service  WHERE ("count" >=$count) AND $timeFilter

来源：https://stackoverflow.com/questions/56648433/how-to-filter-grafana-dashboard-with-greater-than-and-less-than-operators