SQL连接多个表&；获取平均值

我试图在我的sql查询中进行几个连接，但遇到了一个问题。我需要做的是从

poker\u sites

表中选择所有字段，然后从

networks

中抓取2个相对字段，如果可用，从

editor\u content

我遇到的问题是，查询只返回一行，而应该至少返回三行

任何帮助都将不胜感激

这是我的SQL

SELECT AVG(editor_content.rating) AS rating, poker_sites.*,
networks.network_name, networks.network_icon FROM poker_sites
    LEFT JOIN networks
    ON (poker_sites.network_id=networks.network_id)
    LEFT JOIN editor_content
    ON (poker_sites.site_id=editor_content.assign_id)
    WHERE poker_sites.published=1

---

如果希望使用聚合函数（在本例中为AVG）获得多个结果，则需要GROUP BY

---

如果希望使用聚合函数（在本例中为AVG）获得多个结果，则需要GROUP BY

    SELECT x.avgRating AS rating, poker_sites.*,
        networks.network_name, networks.network_icon 
    FROM poker_sites
    LEFT JOIN networks
        ON (poker_sites.network_id=networks.network_id)
    LEFT JOIN 
    (
        SELECT AVG(editor_content.rating) as avgRating, editor_content.assign_id
        FROM editor_content
        GROUP BY editor_content.assign_id
    ) x
        ON (poker_sites.site_id = x.assign_id)
    WHERE poker_sites.published=1