mysql - 选择最受欢迎的商品

Question

我有以下查询:

SELECT
    l.id,
    l.name,
    l.url,
    c.name,
    COUNT(cc.id) AS popularity
FROM
    links AS l,
    categories AS c,
    clicks AS cc
WHERE
    l.category_id = c.id
AND
    l.id = cc.link_id
AND
    l.active = 1
ORDER BY
    popularity DESC
LIMIT 
    10

如您所见，我有 3 个表:链接、类别和点击。在“点击”中，每次点击数字时我都会保存一条记录。我想选择 10 个最受欢迎的链接，但我只获得最后一条记录，其中包含所有点击次数。

我的查询有什么问题？

提前致谢!

Answer 1

似乎你需要分组

SELECT
    l.id,
    l.name,
    l.url,
    c.name,
    COUNT(*) AS popularity
FROM
    links AS l, 
    categories AS c,
    clicks AS cc
WHERE  l.category_id = c.id
AND    l.id = cc.link_id
AND    l.active = 1
GROUP BY l.id, c.name
ORDER BY popularity DESC LIMIT 10