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Asked by jpadkins49 in PostgreSQL Database, WebApplications
All I have a table in a postgre database that I have inherited that contains records that self join. It is a heirarchy tree for supervisors and employees.
The sample table layout is below:
tree_id Parent_id Object_id
1 0 349
1 349 346
1 346 355
The parent_id column is exactly how it sounds. It is the parent of the employee(e.g. manager). The object id is the employee number from the employees table. I need to write a self join query that pulls the heirarchy of the currently employee. For instance if I search by object_id=355, then it will pull all relations up to parent id of zero. So it will pull 346 and 349 from the database also. If you have a parent id of 0, then you are at the top of the heirarchy for that department. I am using this for a mailing notification feature for a leave module that I have developed, but I am unsure on how to get the data that I need via sql. I am not exactly sure I can even pull the data that I need via SQL. Any help will be greatly appreciated.
20091111-EE-VQP-92 - Hierarchy / EE_QW_3_20080625