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