Replace rating field with voted_comments view.

    content TEXT NOT NULL,

    content_html TEXT NOT NULL,

    created_at DATETIME NOT NULL,

    rating INT NOT NULL DEFAULT 0,

    deleted ENUM('Y', 'N') NOT NULL DEFAULT 'N',

    FOREIGN KEY (user_id) REFERENCES users (id),

    FOREIGN KEY (target_id) REFERENCES targets (id)

CREATE VIEW visible_comments AS SELECT * FROM comments WHERE deleted = 'N';

CREATE VIEW voted_comments AS SELECT

    c.*,

    SUM(v.value) AS vote

FROM visible_comments c LEFT JOIN votes v ON c.id = v.comment_id;

-- Example queries

-- get comments for a particular member

WHERE target.domain = ? AND target.type = 'class'

GROUP BY target.cls

-- get users with the highest score

-- get users with most upvotes

SELECT

    user.name,

    SUM(c.rating)

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

    SUM(c.vote) AS votes

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

GROUP BY user.id

ORDER BY votes DESC