Как реализовать OpenID в Java

Надеюсь, это поможет вам -

SELECT completion.userid, completion. coursemoduleid, completion. timemodified, 
module.course, user. idnumber as student_id, m.name as module_name,(CASE WHEN (a.name != '') THEN a.name ELSE (CASE WHEN (ass.name != '') THEN ass.name ELSE q.name END) END) as activity_name
FROM `mdl_course_modules_completion` as completion
join mdl_course_modules as module 
on completion. coursemoduleid = module.id
join mdl_user as user on user.id = completion.userid
join mdl_modules as m on completion. coursemoduleid = m.id
left join mdl_assign as a on a.id = m.id
left join mdl_assignment as ass on ass.id = m.id
left join mdl_quiz as q on q.id = m.id
where m.name in ('assign','assignment','quiz')
LIMIT 0, 30