APEX Tree based on Pipelined Table Function

Representing hierarchical data in an APEX Tree is fairly straight forward, the wizard to create a tree region assists you with that. But when you need to show data from multiple tables, you will need to provide your own query. In a previous blogpost I have written how to achieve that.
It is also possible to create a Pipelined Table Function which can be used a the basis of the APEX Tree. In this blogpost I will show you how to do that.

PIVOT and UNPIVOT

The PIVOT and UNPIVOT operators were introduced in Oracle 11g and the other day I helped out a friend using these operators.
He wanted the data in the columns to be "shifted to the left". To explain a little more, take a look at the following data:

        ID V1    V2    V3    V4    V5
---------- ----- ----- ----- ----- -----
         1 a     b                 e
         2 aaa   bbbb  cccc
         3             a     b     e
         4 a           c           e
         5       b           d

Above is the data as it appeared in the table.
The requirement was to shift the data to the left like the data below:

        ID C1    C2    C3    C4    C5
---------- ----- ----- ----- ----- -----
         1 a     b     e
         2 aaa   bbbb  cccc
         3 a     b     e
         4 a     c     e
         5 b     d

The data in the columns is moved over one or more columns to the left.

Tree with Checkboxes: Save the Data - JS Array to PL/SQL

In two previous blogposts I described a method to transform a regular APEX Tree component to a Tree component with checkboxes. The second blogpost described a way to retrieve the data from the database using JSON and AJAX and check the appropriate checkboxes. In this last part of the series on Tree with Checkboxes I will describe a method to save the checked values to the database.