更新：看起来像是强制报警，我误解了我的结果集，实际上查询返回它应该返回的结果。哎呀。非常感谢大家的帮助！
我的问题怎么了？产生了错误的结果。

SELECT
    utm_source as source,
    utm_medium as medium,
    utm_campaign as campaign,
    utm_content as content,
    COUNT(order_id) as orders,
    COUNT(DISTINCT _customer_user) as customers,
    SUM(_order_total) as revenue,
    SUM(_refund_amount) as refunded,
    SUM(_order_total) - SUM(_refund_amount) as net,
    (SUM(_order_total) - SUM(_refund_amount))/COUNT(DISTINCT _customer_user) as 'average ticket'
FROM wp_realtime_utm_tracking_utms
GROUP BY source, medium, campaign, content