Question

我在我的数据库中有一个已售出的表，我的表看起来像这样：

+-----------+---------------------+---------+---------+ 
| id        | product_id          | user_id | date    |
+-----------+---------------------+---------+---------+
|         1 | 20                  |      2  |392185767| 
+-----------+---------------------+---------+---------+
|         2 | 28                  |      3  |392333337| 
+-----------+---------------------+---------+---------+

我想要按大多数购买的产品对表输出进行排序类似的东西：

$sql = "select * from sold order by most_repeated(product_id)";

我不想按产品ID对输出进行分组，我只是想对它们进行排序，以便最重复的产品显示在结果的顶部

Answer 1

由于您不想分组，您可以使用相关查询：

select * from sold s
order by (select COUNT(1) from sold ss where ss.product_id=s.product_id)

我没有在MySQL中尝试这个，但它应该可以工作。

Answer 2

你根本找不到重复的产品而不计算它。

SELECT product_id, COUNT(product_id) AS product_count
FROM sold
GROUP BY product_id
ORDER BY product_count DESC;

Answer 3

此查询应该可以为您提供所需的内容，而无需多次计算同一产品。

    select s.* 
       from sold s join
        (select count(product_id) as times_purchased, product_id
           from sold
          group by product_id)   most_repeated on s.product_id = most_repeated.product_id
   order by most_repeated.times_purchased

祝你好运！

按最常见的product_id排序销售表

3 个答案: