在php和mysql中计算前5名

嘿，我已经用php和mysql制作了一个评级系统，现在我想选择前5名， 我做了一些东西，但如果用户添加了一个最高等级的评级，它的NR1排名

你们是如何在php和mysql中实现的

该表如下所示：

-身份证

-中段

-液体

-评级

评级是一个从1到5的数字

提前谢谢

正如所指出的，这是一个想法：

SELECT `mid`, SUM(`rating`) AS `total`
FROM `rating`
GROUP BY `mid`
ORDER BY `total` DESC
LIMIT 5

SELECT `mid`, SUM(`rating`) AS `total`
FROM `rating`
GROUP BY `mid`
ORDER BY `total` DESC
LIMIT 5

但是，为了确保评分很少的文章不会进入前五名，您可以添加一个阈值，只允许评分超过X的文章出现在结果中，也许可以更准确地描述前五名：

SELECT `mid`, SUM(`rating`) AS `total`, COUNT(1) AS `nrRatings`
FROM `rating`
GROUP BY `mid`
HAVING nrRatings > 5 // This is the threshold. Only articles with more than
                     // 5 ratings will be considered
ORDER BY `total` DESC
LIMIT 5

正如所指出的，这是一个想法：

SELECT `mid`, SUM(`rating`) AS `total`
FROM `rating`
GROUP BY `mid`
ORDER BY `total` DESC
LIMIT 5

但是，为了确保评分很少的文章不会进入前五名，您可以添加一个阈值，只允许评分超过X的文章出现在结果中，也许可以更准确地描述前五名：

SELECT `mid`, SUM(`rating`) AS `total`, COUNT(1) AS `nrRatings`
FROM `rating`
GROUP BY `mid`
HAVING nrRatings > 5 // This is the threshold. Only articles with more than
                     // 5 ratings will be considered
ORDER BY `total` DESC
LIMIT 5

---

如果我理解你的措辞，看起来1分是最高的？然后，订购人应为ASC。我认为平均价格比总和更合适。完全同意阈值的想法，所以像这样无耻的c/p重写；thx@Machine:P:

SELECT `mid`, AVG(`rating`) AS `avg_rating`, SUM(1) AS `nrRatings` FROM `rating` GROUP BY `mid` HAVING nrRatings > 5 ORDER BY `avg_rating` ASC LIMIT 5

---

如果我理解你的措辞，看起来1分是最高的？然后，订购人应为ASC。我认为平均价格比总和更合适。完全同意阈值的想法，所以像这样无耻的c/p重写；thx@Machine:P:

SELECT `mid`, AVG(`rating`) AS `avg_rating`, SUM(1) AS `nrRatings` FROM `rating` GROUP BY `mid` HAVING nrRatings > 5 ORDER BY `avg_rating` ASC LIMIT 5

---

mid和uid是什么？你在跟踪投票的数量吗？只需要最少的票数就可以进入前五名。中间和中间的票数是多少？你在跟踪投票的数量吗？只需要在前5名中计算最低票数。COUNT*或COUNTrating（如果评级为空）比SUM1更惯用。COUNT*或COUNTrating（如果评级为空）比SUM1更惯用。