Please consider this report of a minor documentation bug. The documentation for Apache module mod_authz_dbd at https://httpd.apache.org/docs/2.4/mod/mod_authz_dbd.html suggests using this SQL select statement to query a database for a user's group memberships:

    AuthzDBDQuery "SELECT group FROM authz WHERE user = %s"

I'm using Mysql via the APR mysql library.  The Mysql server seems to treat 'group' as a reserved word. On apache HTTPD server startup this error appears:

[Tue Apr 12 15:39:06.673658 2022] [dbd:error] [pid 9:tid 140197568732480] (20014)Internal error (specific information not available): AH00632: failed to prepare SQL statements: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group FROM authz WHERE user = ?' at line 1

I suggest changing this doc example to use back-ticks, altho that might be hopelessly specific to Mysql:

    AuthzDBDQuery "SELECT `group` FROM authz WHERE user = %s"

Alternately you might avoid the reserved word entirely and use something like this:

    AuthzDBDQuery "SELECT user_group FROM authz WHERE user = %s"

It might also help if you add a note about the reserved word 'group'.

Thanks for listening!