mysql连接第三个表中的计数行

Question

我有三个这样的mySQL表：

client                   network                   activities
\_id                     \_id                      \_id
\_name                   \_name                    \_client_id
\_[...]                  \[...]                    \_[...]
\_network_id

现在我希望得到以下结果：

client.*, network.name, number_of_activities_for_each_client

其实我有这个选择声明：

select client.*, network.name 
from client 
left join network 
on client.network_id = network.id

如何扩展声明？我也希望看到所有客户。

Answer 1

RootObject rootObject = JsonConvert.DeserializeObject<RootObject>(jsonString);