Question

如何删除其经理在纽约的emp？

员工表

empid       name           salary          location
101          john          10000           newyork
102          pavan         25000           newyork
103          laxman        10000           ahmedabad
104          ram           15000           usa
105          arjun         30000           washington
106          gopal         12000           washington

表部门专栏

empid       dept    managerid
101         a        102
102         a
103         a         102
104         b         105
105         b         
106         b         105

Answer 1

这将适用于某些RDBMS，但不是全部，如果您能告诉我们您使用的是哪种，我们可以提供更完整的解决方案

DELETE FROM employee 
 WHERE emp_id IN (SELECT emp_id FROM department 
                    WHERE manager_id IN 
                         (SELECT emp_id FROM employees WHERE location = "newyork"));

Answer 2

SQL Server解决方案

delete E
  from Employee M
  join department D on D.managerid = M.empid
  join Employee E on E.empid = D.empid
 where M.location = 'usa';

Answer 3

delete from emplyoee where empid in(
select e.empid from emplyoee  e 
left outer join emplyoee   e1 on e.empid=e1.empid
left outer join department d on d.managerid=e1.empid
where e1.location='usa'
)

删除经理位置为美国的员工

3 个答案: