How to find Hierarchies in Oracle (CONNECT BY) & Self Join|Hierarchical queries in oracle by example

Published: 22 February 2020
on channel: NIC IT ACADEMY

12,229

How to find Hierarchies in Oracle (CONNECT BY)
& Self Join |Hierarchical queries in oracle with example|connect by prior in oracle example

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Queries:

select * from employees;

select
e1.employee_id,
e1.first_name,
'Reports to',
e2.employee_id,
e2.first_name
from employees e1,employees e2
where e1.manager_id=e2.employee_id(+) order by 1;

select
e1.employee_id,
e1.first_name,
'Reports to',
e2.employee_id,
e2.first_name
from employees e1 left join employees e2
on e1.manager_id=e2.employee_id order by 1;

Connect by:

select * from employees;

select employee_id,first_name,manager_id
from employees
connect by manager_id =prior employee_id;

select employee_id,first_name,manager_id,prior first_name manager_name
from employees
start with manager_id is null
connect by manager_id =prior employee_id order by 1;

select employee_id,first_name,manager_id,prior first_name manager_name
from employees
start with manager_id is null
connect by prior employee_id = manager_id order by 1;

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