select from InfluxDB where value is null

问题:

If my data (conceptually) is:

#  a b c    ------- 1  1   1 2  1 1 0 3  1 0 1 

Then in legacy SQL language, the statement would be:

select * from table where b is null 

I cannot find a similar condition within the InfluxDB Query Language documentation.

I am working with data where there is optionally a numeric value in a column, and I want to select records where this column is empty/null. Since these are integers, they appear not to work with the matching regexes at all, so something like where !~ /.*/ is out.

回答1:

You cannot search for nulls in InfluxDB <0.9. You will not be able to insert nulls in Influx >=0.9

回答2:

InfluxDB dont understand NULL and will show error if use "is null" or "is not null" in the query. In order to find something which is like null we need to look for empty space ie use empty single quotes as

SELECT * FROM service_detail where username != '' 

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