one of the documented procedures in this installation of the ACS
edu_random_member_blurb   db   class_id
What it does:
Returns a random class member's photograph and a little bio
Defined in: /web/philip/tcl/education.tcl

Source code:

    set users_with_photos_list  [database_to_tcl_list $db  "select u.user_id
           from users_active u, user_group_map ugm
          where u.user_id=ugm.user_id
            and ugm.group_id=$class_id
            and u.portrait is not null"]
#            and u.user_id != [ad_get_user_id]"]

    if { [llength $users_with_photos_list] == 0 } {
	return ""

    # get the lucky user
    set random_num [randomRange [expr [llength $users_with_photos_list] -1] ]
    set portrait_user_id [lindex $users_with_photos_list $random_num]

    set selection [ns_db 0or1row $db  "
select u.first_names || ' ' || u.last_name as name,
       ugm.role, pretty_role
from users u,
     user_group_map ugm,
     edu_role_pretty_role_map m
where u.user_id = ugm.user_id
  and u.user_id = $portrait_user_id
  and ugm.group_id = $class_id
  and m.group_id=$class_id
  and m.role=ugm.role
  and rownum < 2"]

    if { [empty_string_p $selection] } {
	return ""

    # **** this should really be smart and look for the actual thumbnail
    # but it isn't and just has the browser smash it down to a fixed width
    set string_to_return "
<a href=\"/shared/portrait?user_id=$portrait_user_id\"><img width=125 src=\"/shared/portrait-bits?user_id=$portrait_user_id\"></a>
<a href=/shared/community-member?user_id=$portrait_user_id>$name</a>,<br>$pretty_role

    return $string_to_return