mysql查询从子查询迁移

Question

您好我有以下工作查询，但我希望摆脱子查询方法。

select t0.emp_id, t1.first_name, t1.last_name

from employee_profile As t0 left join user_profile as t1 on t0.user_profile_id = t1.id

where t0.emp_id not in (select t4.emp_id from time_sheet as t4 where t4.ts_end_date = '2014-10-08')

有1301个员工档案 结束日期2014-10-08有337没有time_sheets

到目前为止，这种方法非常有效。

现在我正在尝试从子查询迁移到连接中。我试过以下没有成功。

通过这个查询，我得到了与我正在寻找的完全相反的964结果。

select t0.emp_id, t1.first_name, t1.last_name, t3.emp_id

from employee_profile As t0 left join user_profile as t1 on t0.user_profile_id = t1.id 
left join time_sheet as t3 on t0.id = t3.employee_profile_id

我还尝试了以下条件，使用条件得到0结果

1

where t3.ts_end_date = '2014-10-08'
and t3.employee_profile_id is null

2

where t3.ts_end_date = '2014-10-08'
and t3.id is null

有人知道如何解决这个问题吗？

Answer 1

想出来

select t0.emp_id, t1.first_name, t1.last_name, t3.emp_id

from employee_profile As t0 left join user_profile as t1 on t0.user_profile_id = t1.id 
left join time_sheet as t3 on t0.id = t3.employee_profile_id and t3.ts_end_date = '2014-10-08'

where t3.employee_profile_id is null