Question

我有一张寄售表格（当然是简化的）

CONSIGNMENT_NR    CUSTOMER
1                 1
2                 1
3                 2
4                 2
5                 2

我可以轻松地为每个客户选择他们有多少托运货物：

SELECT CUSTOMER, COUNT(*) AS 'Count'
FROM CONSIGNMENT
GROUP BY CUSTOMER

谁会给我（带有示例数据）

CUSTOMER   Count
1          2
2          3

但是我想要获得的客户数量是x托运的数量。我想要的数据如下所示：

Amount     No of Customers
2          1
3          1

我不太清楚怎么做。

Answer 1

将查询打包为派生表。 GROUP BY其结果：

select Amount, count(*) as No_of_Customers
from
(
    SELECT COUNT(*) AS Amount
    FROM CONSIGNMENT
    GROUP BY CUSTOMER
) dt
group by Amount

Answer 2

您可以在下面尝试-使用子查询

select count(distinct customer) as noofcustomer, 'Count'
from
(
SELECT CUSTOMER, COUNT(*) AS 'Count'
FROM CONSIGNMENT
GROUP BY CUSTOMER
)A group by 'Count'

SQL-按组分组属性？

2 个答案: