When upgrading from 1.8.5+ (Build: 20080507) to 1.9.2+ (Build: 20080725), the following schema inconsistencies occur:

1.) groupings_groups.groupid does not have a default set, though lib/db/install.xml has default="0"
2.) groups.courseid has default of 0, though lib/db/install.xml has no default
3.) groups.enrolmentkey has a default of '', though lib/db/install.xml has no default
4.) groups.name is varchar(255), though lib/db/install.xml is varchar(254)