Question

我希望计算每封电子邮件的总订单数量，然后将结果的频率分组

如果以下查询

SELECT COUNT(*) as total
FROM orders
GROUP BY email 
ORDER BY total DESC

给我

|--TOTAL--|
|    6    |
|    6    |
|    6    |
|    5    |
|    5    |
|    5    |
|    4    |
|    4    |
|    3    |
|    2    |
|---------|

我怎样才能得到这个结果

|--TOTAL--|--COUNT--|
|    6    |    3    |
|    5    |    3    |
|    4    |    2    |
|    3    |    1    |
|    2    |    1    |
|-------------------|

我基本上想要数数

干杯

Answer 1

试试这个：

SELECT total, COUNT(total) AS frequency
FROM (
  SELECT COUNT(*) as total
  FROM orders
  GROUP BY email
) t
GROUP BY total
ORDER BY total DESC

基本上，您可以通过将原始查询转换为子查询来执行其他聚合。

Answer 2

您可以将查询用作子查询：

SELECT total, COUNT(*)
FROM (
  SELECT COUNT(*) as total
  FROM orders
  GROUP BY email
) t
GROUP BY total
ORDER BY COUNT(*) DESC

MYSQL对计数结果进行计数和分组

2 个答案: