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1AQA ICT AS Level © Nelson Thornes 2008
1AQA ICT AS Level © Nelson Thornes 2008
Types of data
2AQA ICT AS Level © Nelson Thornes 2008
2AQA ICT AS Level © Nelson Thornes 2008
• Reminder: What is data
• Data represents raw facts and figures or a set
of values.
• Types of data: can be in othe formats as well
as text and numbers. It could also be in the
format of moving images or sound.
• When storing information in a database such
as Access, Oracle or MYSQL it is important
you get the data type right as it will store the
information based on the data type.
3AQA ICT AS Level © Nelson Thornes 2008
3AQA ICT AS Level © Nelson Thornes 2008
Data types
Is data always words or numbers?
No. Here are the data types available in Access.
Click on one or more
hyperlinks to find out
more.
Text, Memo, Number,
Date/Time, Currency,
AutoNumber, Yes/No,
OLE Object, Hyperlink,
Lookup Wizard
Click here when you have finished investigating
data types.
4AQA ICT AS Level © Nelson Thornes 2008
4AQA ICT AS Level © Nelson Thornes 2008
In a database, what field names would expect data
type text?
Surname
Address line 1
Mode of transport
Telephone number*
*Click here for more information on telephone
numbers or here to continue.
Text
5AQA ICT AS Level © Nelson Thornes 2008
5AQA ICT AS Level © Nelson Thornes 2008
Why is 01225 843878 treated as text?
Although the data is made up of numbers this is
really a code. Telephone numbers used to contain
letters as well.
Databases can include calculated fields but
calculations cannot be formed with telephone
numbers.
Click here to continue with the presentation.
Telephone number
6AQA ICT AS Level © Nelson Thornes 2008
6AQA ICT AS Level © Nelson Thornes 2008
Memo fields enable you to enter continuous, free
response text. You do not have to specify the field
length as you would with a text field.
The maximum length is 65,535 characters.
Click here to continue.
Memo
7AQA ICT AS Level © Nelson Thornes 2008
7AQA ICT AS Level © Nelson Thornes 2008
Number
This one is very straightforward. It is used to store
numerical data.
Remember that Access can use these fields to
carry out calculations – a calculated field.
Click here to continue.
8AQA ICT AS Level © Nelson Thornes 2008
8AQA ICT AS Level © Nelson Thornes 2008
You can set these fields to store a date or time or
both. The Input Mask lets you choose how you want
it displayed.
Click here to continue.
Date and Time
9AQA ICT AS Level © Nelson Thornes 2008
9AQA ICT AS Level © Nelson Thornes 2008
Currency fields are the same as numbers but set to 2
decimal places.
They also display the currency symbol, for example
£, €.
Click here to continue.
Currency
10AQA ICT AS Level © Nelson Thornes 2008
10AQA ICT AS Level © Nelson Thornes 2008
This field will automatically number your records.
It will not allow duplicates so you could use this field
as the key field.
Click here to continue.
Auto number
11AQA ICT AS Level © Nelson Thornes 2008
11AQA ICT AS Level © Nelson Thornes 2008
A logical field expects the data to be Yes or No, or
True or False. Data entry is done by ticking the box
using the mouse. James and Maureen have
passed, David has not.
Click here to continue.
Yes/No
12AQA ICT AS Level © Nelson Thornes 2008
12AQA ICT AS Level © Nelson Thornes 2008
This data type enables you to include pictures or
sounds in your database.
Click here to continue.
OLE Object
13AQA ICT AS Level © Nelson Thornes 2008
13AQA ICT AS Level © Nelson Thornes 2008
This will put a hyperlink on your reports, perhaps
the subject’s email address or a webpage.
You may have e-mail address as a field but this will
enable you to access it.
Click here to continue.
Hyperlink
14AQA ICT AS Level © Nelson Thornes 2008
14AQA ICT AS Level © Nelson Thornes 2008
A lookup simplifies data entry as you can select
from a drop down box. Here, you select the name
of the GP without having to type it in.
Click here to continue.
Lookup
15AQA ICT AS Level © Nelson Thornes 2008
15AQA ICT AS Level © Nelson Thornes 2008
Data on its own has no meaning. 16,31,17,04,20,39
is just a series of numbers. Once processed it
becomes information, for example, the data is a
string of candidate numbers and marks.
The candidate numbers can be looked up to find
candidate name. The marks can be looked up in a
table of grade boundaries. So the information
would be:
Robinson, B C Grade
Leighton, M U Grade
Ahmed, M B Grade
Data is input to a computer system and, after
processing, becomes information.
Summary

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Data types

  • 1. 1AQA ICT AS Level © Nelson Thornes 2008 1AQA ICT AS Level © Nelson Thornes 2008 Types of data
  • 2. 2AQA ICT AS Level © Nelson Thornes 2008 2AQA ICT AS Level © Nelson Thornes 2008 • Reminder: What is data • Data represents raw facts and figures or a set of values. • Types of data: can be in othe formats as well as text and numbers. It could also be in the format of moving images or sound. • When storing information in a database such as Access, Oracle or MYSQL it is important you get the data type right as it will store the information based on the data type.
  • 3. 3AQA ICT AS Level © Nelson Thornes 2008 3AQA ICT AS Level © Nelson Thornes 2008 Data types Is data always words or numbers? No. Here are the data types available in Access. Click on one or more hyperlinks to find out more. Text, Memo, Number, Date/Time, Currency, AutoNumber, Yes/No, OLE Object, Hyperlink, Lookup Wizard Click here when you have finished investigating data types.
  • 4. 4AQA ICT AS Level © Nelson Thornes 2008 4AQA ICT AS Level © Nelson Thornes 2008 In a database, what field names would expect data type text? Surname Address line 1 Mode of transport Telephone number* *Click here for more information on telephone numbers or here to continue. Text
  • 5. 5AQA ICT AS Level © Nelson Thornes 2008 5AQA ICT AS Level © Nelson Thornes 2008 Why is 01225 843878 treated as text? Although the data is made up of numbers this is really a code. Telephone numbers used to contain letters as well. Databases can include calculated fields but calculations cannot be formed with telephone numbers. Click here to continue with the presentation. Telephone number
  • 6. 6AQA ICT AS Level © Nelson Thornes 2008 6AQA ICT AS Level © Nelson Thornes 2008 Memo fields enable you to enter continuous, free response text. You do not have to specify the field length as you would with a text field. The maximum length is 65,535 characters. Click here to continue. Memo
  • 7. 7AQA ICT AS Level © Nelson Thornes 2008 7AQA ICT AS Level © Nelson Thornes 2008 Number This one is very straightforward. It is used to store numerical data. Remember that Access can use these fields to carry out calculations – a calculated field. Click here to continue.
  • 8. 8AQA ICT AS Level © Nelson Thornes 2008 8AQA ICT AS Level © Nelson Thornes 2008 You can set these fields to store a date or time or both. The Input Mask lets you choose how you want it displayed. Click here to continue. Date and Time
  • 9. 9AQA ICT AS Level © Nelson Thornes 2008 9AQA ICT AS Level © Nelson Thornes 2008 Currency fields are the same as numbers but set to 2 decimal places. They also display the currency symbol, for example £, €. Click here to continue. Currency
  • 10. 10AQA ICT AS Level © Nelson Thornes 2008 10AQA ICT AS Level © Nelson Thornes 2008 This field will automatically number your records. It will not allow duplicates so you could use this field as the key field. Click here to continue. Auto number
  • 11. 11AQA ICT AS Level © Nelson Thornes 2008 11AQA ICT AS Level © Nelson Thornes 2008 A logical field expects the data to be Yes or No, or True or False. Data entry is done by ticking the box using the mouse. James and Maureen have passed, David has not. Click here to continue. Yes/No
  • 12. 12AQA ICT AS Level © Nelson Thornes 2008 12AQA ICT AS Level © Nelson Thornes 2008 This data type enables you to include pictures or sounds in your database. Click here to continue. OLE Object
  • 13. 13AQA ICT AS Level © Nelson Thornes 2008 13AQA ICT AS Level © Nelson Thornes 2008 This will put a hyperlink on your reports, perhaps the subject’s email address or a webpage. You may have e-mail address as a field but this will enable you to access it. Click here to continue. Hyperlink
  • 14. 14AQA ICT AS Level © Nelson Thornes 2008 14AQA ICT AS Level © Nelson Thornes 2008 A lookup simplifies data entry as you can select from a drop down box. Here, you select the name of the GP without having to type it in. Click here to continue. Lookup
  • 15. 15AQA ICT AS Level © Nelson Thornes 2008 15AQA ICT AS Level © Nelson Thornes 2008 Data on its own has no meaning. 16,31,17,04,20,39 is just a series of numbers. Once processed it becomes information, for example, the data is a string of candidate numbers and marks. The candidate numbers can be looked up to find candidate name. The marks can be looked up in a table of grade boundaries. So the information would be: Robinson, B C Grade Leighton, M U Grade Ahmed, M B Grade Data is input to a computer system and, after processing, becomes information. Summary

Editor's Notes

  1. This presentation differentiates between ICT professional and end users.