尝试将我们的基本镜像迁移到稳定的Ubuntu 18.04,当我们尝试添加gpg密钥时,得到这个错误:gpg:failed to start agent '/usr/bin/gpg-agent': No such file or directory
gpg: can't connect to the agent: No such
52Z]: Connecting to 10.1.5.85 as simonhDEBUG[2016-07-15 11:25:03Z]: Deploying profiler agent to 10.1.5.85from Mac remote agent
DEBUG[2016-07-15 11:25:16
agent (agent_id, salary, city, country)“列出至少有6个城市的每个国家的代理商人数和总工资。”我的问题是如何对不稳定的国家进行分组,并统计与国家有关的城市数量。我不太确定如何执行所需的子查询或group by子句。我试着做以下的事情。select COUNT(agent_id) as numOfAgents, SUM(salary) a