数据库中 查询结果的 并集,交集是怎么写的啊,用的什么关键字答:union select empno, ename ,salary ,deptno from employee_ccy where salary>100;--union all 不排序,不去重复 select empno, ename ,salary ,deptno from employee_ccy where deptno=10 union all select empno, ename ,salary ,deptno from employee_ccy where salary>100;---交集---interse...