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"Day Trip Database"
To move on, you need
to have completed your research about potential trips out.
Have this with you as you complete the next stage - creating your
database. If you haven't found everything - such as the
travelling time for each place - this doesn't matter. The
great thing about databases is that you can edit and improve your
data later on.
Directions
1. Data types.
If you think back to the information we need about each destination,
there are lots of different "types" of data. Databases can
handle all the different types of data, but you need to set the data
type for each field. If you think back to your
Excel lesson, you will find some of
these very familiar.
2. There are many
different data types - as shown below:
|
Text |
Basic text that
can be letters, symbols or numbers. This will just show
information and will not be used for any calculations. |
|
Hyperlink |
A text field
that is a weblink. |
|
Number |
This must just
include numbers and can be used for calculations. |
|
Currency |
Just for money. |
|
Memo |
Used for notes
and comments. |
|
Date / Time |
Just for dates
and times. |
|
Boolean |
Also known as
'Yes / No'. This is used whenever there are only two
possible values - e.g. yes or no, true or false. |
|
AutoNumber |
Created by
automatically Access - this is the individual number for each
record. |
3. So why have we
bothered with all this? Why can't we just enter our data?
As has been mentioned before, careful planning and preparation makes
a much better database. If you set the data types correctly
you can use them for powerful calculations. If you have just
entered the data as text, it cannot be used for calculations.
4. Naming
conventions. This is another area that people find tricky, but
once understood is really simple. It is important to use the
correct conventions for your field names. This is so
Access can perform powerful calculations and produce useful results.
Each field name must not include any spaces. Access adds the
letters "tbl" to the start of each
field name. As you can't use spaces, is is a good idea to use
capital letters to make field names easier to read.
Using your previous planning, we are going to use the following
names. See how the field names use capital letters (but no
spaces!)
|
Field Name |
Data Type |
Description |
|
TripNo |
AutoNumber |
|
|
Name |
Text |
Name of place |
|
Location |
Text |
Location |
|
ContactNo |
Text |
Phone number |
|
ContactWeb |
Hyperlink |
Web address |
|
Activities |
Memo |
Potential
activities |
|
Requirements |
Text |
Special
requirements |
|
EntranceCost |
Currency |
Entrance cost |
|
Distance |
Number |
Distance |
|
TravelTime |
Time |
Travelling time |
|
TravelCost |
Currency |
Travelling cost |
5. Think about what we
have done so far. It all looks terribly complicated doesn't
it? However, if you think carefully, it does all make sense -
you have researched the different places and now taken time to
properly plan your database.
6. Load Access and
select "Blank Access Database". You will need to create a new
folder and a name for the database. Create the new folder,
type "DayTripDatabase" in the file name box and press
"Create".
7. This is where your
careful planning and preparation will pay off. Every Access
database has a Database window - this is where you can select the
different objects - Tables, Queries, Forms and Reports. From
the screen that appears, make sure that the "Tables" tab is
selected, and press "New":

8. Select "Design
View" (the second option) and press
"OK". The Table Design window appears - this is where we are going
to set up all our fields. If you look at the screen you can
see some of the terms you are becoming used to. We are
going to enter the "Field Name", define the "Data Type" and add a
"Description".
9. Use the information
in the table above. The first field name you need to type in
is "TripNo". Do this, and then select "AutoNumber" from the
dropdown menu:

10. In Access we need
to set up a Primary Key. This is the field that Access
uses to identify each record. To set "TripNo" as the Primary
Key make sure TripNo is select and then press the Primary Key button
from the toolbar at the top. See if you can find this - it
isn't tricky!
11. With the Primary
Key selected you now need to enter all the other fields. Type
in the other field names, select their data type and add your own
description. Use the information from the yellow table in
point 4 above. You should end up with 11 completed rows.
12. When complete,
click on Save. Call your table "Table1".
All done?
Make sure you have saved!
Move onto the next task. |