by Ken Task.
table is mdl_logstore_standard_log ... the who done it table.
column is action ... loggedin and loggedout are recorded.
No report exist with that specific info so you might have to install
a plugin that will allow you to gen your own reports.
Customizable Reports is one
Query something like:
select userid,action,courseid,relateduserid,timecreated,origin,ip from mdl_logstore_standard_log where action like 'logged%'
'SoS', Ken