Add a few more interesting example queries.

ORDER BY votes DESC

LIMIT 10;

-- get users with most downvotes

SELECT

    users.username,

    SUM(c.vote) AS votes

FROM users LEFT JOIN voted_comments c ON c.user_id = users.id

GROUP BY users.id

HAVING votes IS NOT NULL

ORDER BY votes ASC

LIMIT 10;

-- get users with most comments

SELECT

    users.username,

    COUNT(*) AS comment_count

FROM users LEFT JOIN visible_comments c ON c.user_id = users.id

GROUP BY users.id

ORDER BY comment_count DESC

LIMIT 10;

-- get users with most edits

SELECT

    users.username,

    COUNT(*) AS updates_count

FROM users LEFT JOIN updates u ON u.user_id = users.id

GROUP BY users.id

ORDER BY updates_count DESC

LIMIT 10;

-- get all moderators, sorted by comment counts

SELECT

    username,

    COUNT(*) AS comment_count

FROM users LEFT JOIN visible_comments c ON c.user_id = users.id

WHERE users.moderator = 1

GROUP BY users.id

ORDER BY comment_count DESC;