我正在尝试构造正确的sql语句(Oracle)以获取每个customer_id的device_id的计数大于给定值.例如,我想知道拥有3个以上device_ids的customer_id.单个device_id只能有一个customer_id与之关联,而customer_id可能有许多device_id.

Table:
device_id
customer_id
....

Data (device_id,customer_id):
00001,CUST1
00002,CUST1
00003,CUST1
00004,CUST1
00005,CUST2
00006,CUST2

为了获得超过3台设备的客户：

select customer_id,count(device_id)
from YourTable
Group by customer_id
having count(device_id) > 3