[CentOS] rpm user and groups

Hi!
This is a rpm question.
For example, mysql-server is adding mysql user with uid 27
Is this something I can ask the rpm db?

It seems not, because something like the following seems to give me no
useful information regarding users or uids

$ rpm -qa --provides|grep mysql

I would like to ask: what package would install uid XXX. How? Not possible?
-- 
Kind Regards, Markus Falb

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