This optional parameter specifies an SQL query that is used to
get check items for a user's group. Special characters are supported, as
well as a single bind variable for the group name being searched. Defaults
to:
SELECT radgroupcheck.id,radgroupcheck.GroupName,radgroupcheck.Attribute,
radgroupcheck.Value,radgroupcheck.op FROM
radgroupcheck,usergroup WHERE usergroup.Username = ? AND
usergroup.GroupName = radgroupcheck.GroupName ORDER BY radgroupcheck.id