Hoe kan ik aliassen gebruiken in de GROUP BY-clausule?

Niet zeker wat je probeert te doen. Maar u kunt uw zoekopdracht in een subquery plaatsen zonder range_day in de GROUP BY-clausule. Gebruik dan uw GROUP BY-clausule in de buitenste query zoals deze is.

SELECT  SUM(score) score,
    type,
    context, -- WARNING! Not listed in group by clause
    post_id,
    table_code,
    comment_id,
    MIN(seen) seen,
    MAX(d_t) d_t,
    range_day
FROM (
    SELECT  SUM(score) score,
        MAX(id) as id,
        type,
        context, -- WARNING! Not listed in group by clause
        post_id,
        e.table_code,
        comment_id,
        MIN(seen) seen,
        MAX(date_time) d_t,
        (CASE   WHEN FROM_UNIXTIME(MAX(date_time)) >= CURDATE() THEN 'today'
            WHEN FROM_UNIXTIME(MAX(date_time)) >= DATE_SUB(CURDATE(), INTERVAL 1 DAY) THEN 'yesterday'
            WHEN FROM_UNIXTIME(MAX(date_time)) >= DATE_SUB(CURDATE(), INTERVAL 7 DAY) THEN 'in last week'
            ELSE 'in last month'
        END) as range_day
    FROM `events` e
    WHERE e.id IN ($ids)
    GROUP BY type, post_id, e.table_code, comment_id
) sub
GROUP BY type, post_id, table_code, comment_id, range_day
ORDER BY seen, MAX(d_t) desc, MAX(id) desc

Echter - u selecteert context zonder aggregatie die niet wordt vermeld in de GROUP BY-clausule. U krijgt dus een "willekeurige" waarde van de groep. In de strikte modus zal de query mislukken.