arrays,structures for reports

I am about to start some reporting projects
For querying from the DB and outputting to a display page,
I was told that arrays, structures are useful for these projects.

I am white belt in CF and Web stuff.
Someone in the meeting has mentioned to me to use
Arrays
Structures
In my reports.


ARRAYS
· How can I use arrays to out put HTML records from an oracle query?

· How is it useful for displaying output (database)?

Also,

· What is the difference between 1 dimensional vs. 2 dimensional arrays?

· Cfdump? Do I need to use this?
STRUCTURES
How can I use Structures to these kinds of projects? With arrays

Thank you very much