选择一个表与另一个表的否定以及oracle主表sql查询中的数据

Question

I am stuck with an issue. I have 3 tables in my oracle database. First table contains all registered employees: ID, FNAME, LNAME Second table contains all employees(Registered + Unregistered): - ID, FNAME, LNAME Third table is a master table having all details of employee along with address. ID is common in all 3 tables.

Here my requriment is to write a query which will display all not registered employees with there address details.

Some ID's are null as well in all tables which have to be neglected.

Table 1 - Registered Users Table 2 - Registered+Not Registered Table 3 - Master Table which contains additional information

Requirement:- Select ID, Name, Address for not registered users.

Query will be more helpful instead of explanation.

Thanks,

Answer 1

I think not exists or not in does what you want:

select m.*
from masters m
where not exists (select 1
                  from registered r
                  where r.id = m.id
                 );