问题
Is there any shortform syntax in influxdb to query for membership in a list? I'm thinking of something along the lines of
SELECT * FROM some_measurement WHERE some_tag IN ('a', 'b', 'c')
For now I can string this together using ORed =s, but that seems very inefficient. Any better approaches? I looked through the language spec and I don't see this as a possibility in the expression productions.
Another option I was thinking was using the regex approach, but that seems like a worse approach to me.
回答1:
InfluxDB 0.9 supports regex for tag matching. It's the correct approach although of course regex can be problematic. It's not a performance issue for InfluxDB, and in fact would likely be faster than multiple chained OR statements. There is no support yet for clauses like IN or HAVING.
For example: SELECT * FROM some_measurement WHERE some_tag =~ /a|b|c/
来源：https://stackoverflow.com/questions/32063055/querying-for-tag-values-in-a-given-list