Note: for a join on n tables, there are potentially O(n!) possible trees
The query optimiser aims to find version with lowest total cost.
![[prev]](icon/prev.gif){kind=icon}
38
![[next]](icon/next.gif){kind=icon}
![[Diagram:Pics/qproc/join-trees.png]](Pics/qproc/join-trees.png)