Databases Reference
In-Depth Information
Creating the Reports sheet
Now that we've created our
Dashboard
and
Analysis
sheets, it is time to create the
final sheet from our DAR setup: the
Reports
sheet.
As was defined in the requirements, we will be creating the following objects:
• Aggregated flights per month
• KPIs per carrier
But before we begin creating new objects, let's first take a quick look at how we can
re-use the expressions that we have created earlier.
Variables
By now you may have noticed that we are using the same expressions in many
places. While we could simply type in the same expression every time, this approach
has two disadvantages:
• We risk introducing (minor) variations in the way expressions are calculated.
For example, one "revenue" expression might contain sales tax while another
does not.
• It makes maintenance harder; if the way an expression is calculated changes
we'd have to change it in many different places in our document, though the
Expression Overview
window can help us simplify that task.
Enter
variables
. Variables make it easy to store expressions (and other statements,
but more on that later) in a central location from where they can be referenced
anywhere in our document.
Let's start by creating a variable to store the expression for the
Load Factor %
KPI:
1.
Go to
Settings
|
Variable Overview
in the menu, or click
Ctrl
+
Alt
+
V
, to
open the
Variable Overview
window.
2.
Click on
Add
, enter
eLoadFactor
in the
Variable Name
input box, and click
on
OK
.
3.
While you would expect it, the new variable is not selected by default after
creation. Highlight the
eLoadFactor
variable and enter the following in the
Definition
input box
:
(Sum ([# Transported Passengers]) / Sum ([# Available Seats]))
4.
In the
Comment
box, enter the description as
The number of transported
passengers versus the number of available seats
.
