Useful SQL scripts

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If you are a Moodle site administrator, then probably this is the best collection of SQL queries which can be utilized to make custom reports on your Moodle site.

WIRIS

Few of the useful SQl queries are:

Student (user) COUNT in each Course

SELECT concat('<a target="_new" href="%%WWWROOT%%/course/view.php?id=',course.id,'">',course.fullname,'</a>') AS Course
,concat('<a target="_new" href="%%WWWROOT%%/user/index.php?contextid=',context.id,'">Show users</a>') AS Users
, COUNT(course.id) AS Students
FROM prefix_role_assignments AS asg
JOIN prefix_context AS context ON asg.contextid = context.id AND context.contextlevel = 50
JOIN prefix_user AS USER ON USER.id = asg.userid
JOIN prefix_course AS course ON context.instanceid = course.id
WHERE asg.roleid = 5
# AND course.fullname LIKE '%2013%'
GROUP BY course.id
ORDER BY COUNT(course.id) DESC

Most popular ACTIVITY

SELECT COUNT(l.id) hits, module
FROM prefix_log l
WHERE module != 'login' AND module != 'course' AND module != 'role'
GROUP BY module
ORDER BY hits DESC

 

Courses without Teachers

SELECT concat('<a target="_new" href="%%WWWROOT%%/course/view.php?id=',c.id,'">',c.fullname,'</a>') AS Course
,(SELECT COUNT( ra.userid ) AS Users FROM prefix_role_assignments AS ra
JOIN prefix_context AS ctx ON ra.contextid = ctx.id
WHERE ra.roleid = 3 AND ctx.instanceid = c.id) AS Teachers
FROM prefix_course AS c
ORDER BY Teachers ASC

User Report
You can also use the popular report plugins like:
Ad-hoc database queries : https://moodle.org/plugins/view/report_customsql
Configurable Reports : https://moodle.org/plugins/view/block_configurable_reports