获取具有最大值的单元格的整个行/行

Question

我有下表：

我需要找到最大product_count的行。 这是我尝试过的SQL，但未给出正确的结果：

SELECT product_id, MAX(product_count)
GROUP BY product_id

编辑：

SELECT product_id, MAX(product_count) as max_count
FROM
(
    SELECT product_id, COUNT(product_id) as product_count
    FROM wp_stvp_voting_data
    GROUP BY product_id
) as T1
GROUP BY product_id

Answer 1

一个简单的选择是使用LIMIT：

SELECT product_id, COUNT(product_id) AS product_count
FROM wp_stvp_voting_data
GROUP BY product_id
ORDER BY COUNT(product_id) DESC
LIMIT 1;

如果您需要解决可能存在多个记录以获取最大商品数量的情况，并且希望返回所有联系，那么我们可以尝试使用子查询：

SELECT product_id, COUNT(product_id) AS product_count
FROM wp_stvp_voting_data
GROUP BY product_id
HAVING COUNT(product_id) = (SELECT MAX(cnt) FROM (
                               SELECT COUNT(*) AS cnt
                               FROM yourTable
                               GROUP BY product_id
                           ) t)

如果您使用的是MySQL 8+，那么我们将可以利用ROW_NUMBER：

SELECT product_id, product_count
FROM
(
    SELECT product_id, COUNT(product_id) AS product_count,
        ROW_NUMBER() OVER (ORDER BY COUNT(product_id) DESC) rn
    FROM yourTable
    GROUP BY product_id
) t
WHERE rn = 1;

如果要把所有领带都放在第一位，请将ROW_NUMBER替换为RANK。