Subquery on the same table
Is it possible to do a subquery on the same table?
Example of what I want; A user has a manager. Therefore, the table user contains attributes: id, name, ..., managerId. Is there a (sub)query possibility to select the name of the manager directly when selecting the user?
Example of what I want; A user has a manager. Therefore, the table user contains attributes: id, name, ..., managerId. Is there a (sub)query possibility to select the name of the manager directly when selecting the user?
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but t1 = t2 in my case?
Hi,
As you said that user has a manager... mean every user is mapped to some or other manager...
you can write join between the table...
select * from xyz inner join
abc on xyz.managerid = abc.managerid
where abc.userid = '12345'
i think this will solve the issue...
As you said that user has a manager... mean every user is mapped to some or other manager...
you can write join between the table...
select * from xyz inner join
abc on xyz.managerid = abc.managerid
where abc.userid = '12345'
i think this will solve the issue...
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>but t1 = t2 in my case?
"no". the table alias "t2" given to t1 makes it virtually 2 tables.
"no". the table alias "t2" given to t1 makes it virtually 2 tables.
taking anycrofts query :
select emp.id, emp.name employee_name, mgr.name manager_name
from table emp
join table emp mgr
on emp.managerId = mgr.ID
the alias mgr refers to table emp also, but allows to join to another row.
ASKER
thanks
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select emp.id, emp.name, mgr.name from table emp
join table mgr
on emp. managerId = mgr.ID