I have been looking into Adjacency List and Nested Set Model to find the optimal tree solution. Up until now I thought one of the main advantages of Nested Set Model was that I could use one SQL q...

There are two ways to work with hierarchy data in MySQL: Adjacency List Model Nested Set Model A major problem of the Adjacency List Model is that we need to run one query for each node to get ...

I've been using the crap out of the Nested Set Model lately. I have enjoyed designing queries for just about every useful operation and view. One thing I'm stuck on is how to select the immediate c...

Let's dig in the main problem right away, I have the input like this $category = array( 'A' => array('left' => 1, 'right' => 8), 'B' => array('left' => 2, 'right' => 3), 'C' =...

I want a simple predicate that returns me all the groups which have mode = 0 and the mode of the enrollments in the group = 0 To be precise i need a predicate to access the nested object properti...