我对我的这些答案有一些疑问,如果你们能澄清我是对还是错,我将不胜感激,一个员工可以被分配到多个项目,一个项目可以有多个员工。考虑以下关系模式,并为以下查询编写SQL语句。(5分)(a) SELECT empName FROM Employees WHERE empDOB < '31-01-1980' AND projType = (SELECT projTypeempID FROM Employees GROUP BY (SELECT projID From Projects) HAVING COUNT(*)&g
我希望有更多知识的人能在Ubuntu16.04及以后的版本中解释一些关于做apt-get upgrade的事情。我看到的行为是,apt-get upgrade有时不会安装新的内核包,有时会:The following packages have been kept back:我知道做dist-upgrade会安装这些软件包(所以不要重复这个<e
我发现这个"AWS简单查询服务“成了一个测验网站的问题。Mr. A now wants to decouple the data sending such that the application keeps processing and sending data but does not
wait for an acknowledgement of DB.