Databases Reference
In-Depth Information
We will solve the problem by merging all these tables into a single
Aircraft Types
dimension table. The following schematic shows the general approach we will
be taking.
We will begin by joining the
Aircraft Groups
table to the
Aircraft Types
table. We
will then concatenate (or union, for SQL connoisseurs) the
Aircraft Types 2010
table
to the result we got by joining the
Aircraft Groups
table to the
Aircraft Types
table.
To achieve this, we follow these steps:
1.
Go back to the script editor by pressing
Ctrl
+
E
or by selecting
File | Edit
Script
from the menu.
2.
Go to the
LOAD
statement for the file
Aircraft_Group.csv
and replace the
text
[Aircraft Groups]:
with the text
LEFT JOIN ([Aircraft Types])
.
3.
Next, go to the
LOAD
statement for the file
Aircraft_2010_Update.
csv
and replace the text
[Aircraft Types 2010]:
with the text
CONCATENATE([Aircraft Types])
.
4.
Replace the line reading
AC_GROUPNAME,
with
SubField(AC_GROUPNAME, ',
', 1) as [Aircraft Engine Type],
and press
Return
to create a new line.
5.
On this new line enter
SubField(AC_GROUPNAME, ', ', 2) as [Aircraft
Number Of Engines],
.
6.
Beneath the
LOAD
statement for the file
Aircraft_2010_Update.csv
add
the following code:
DROP FIELD [%Aircraft Group Type] FROM
[Aircraft Types];
.
