实验实验41.用select 语句查询departments和salary表中的所有数据：select salary.*, departments.* from salary ,departments 2、查询departments 中的departmentid：select departmentid from departments go3、查询 salary中的 income，outcome：select income,outcome from salarygo4、查询employees表中的部门号，性别，要用distinct消除重复行：select distinct(departmentid), sexfrom employees 5、查询月收入高于2000元的员工号码：select employeeid from salarywhere income2000go6、查询1970年以后出生的员工的姓名和住址：select name ,address from employees wher
