Question

Ok, so I have a table with TaskID and ChildOf as fields… so …

TaskID is Unique and Auto-Increment

If ChildOf == 0, then it has no Parent (top tier)...

If ChildOf != 0, then it is assigned TaskId of its Parent

Question: How to form a query to give the results like this …

Parent Task
 Child Task
 Child Task

Parent Task
 Child Task

Etc.. etc... 

Would it be easier if I use two tables? I’m going to have a lot of items in this table so I want to use as few queries (loops) as possible.

Any help is greatly appreciated.

Thanks

Answer 1

I think there is one way by which you have to just do soting without using join….

this is as follow –

select * from table_name order by decode(ChildOf,0,TaskID,ChildOf),ChildOf

this will give desired output…

means parent node and then respective child node…
and then second parent node and so on..

one thing I don’t know whether docode function runs on my sql as well or not..

if not then you can use following query –

select * from table_name order by case when ChildOf=0 then TaskID else ChildOf end,ChildOf