The WebGroupMembership table stores the list of members of the site groups.
Warning Modifying the database schema or database structures is unsupported. Changes that you make to the database contents may be overwritten when you install updates or service packs for Windows SharePoint Services, or when you upgrade an installation to the next product version.
|Column name||Data type||Description|
|WebID||uniqueidentifier||GUID of the Web site to which the member belongs. Found in the Webs table.|
|GroupID||int||ID of the site group to which the user belongs. Found in the WebGroups table.|
|MemberID||int||UserId of the user added to the site group. Found in the UserInfo table.|