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Is this ranking by # of orgs using Postgres, or relative total company value using Postgres, or some even more ambiguous effectiveness metric?

A DB system that works for professionals and doesn't require any public ecosystem of training materials won't be mentioned much in public.

thats likely why they're also including mentions in job postings in their metric

> Number of job offers, in which the system is mentioned

its not a silver bullet, but I do think its at least somewhat representative of popularity.