Download Field name Data Type

Questions A
Data is to be stored in a structure and to do this a data type must be chosen for
each item of data.
Choose a suitable data type from the following list for the data shown in the
table:
Logical/Boolean
Alphanumeric
Numeric
Date
without dots is just words
Name of Field
Title
Phone number
Sex
Country
Data of Birth
Years at address
2.
Example data
(Mr,Mrs,Ms,Dr,etc.)
155-6655-1173
M or F
Botswana
01/10/03
4
Data type
alphanumeric/text
alphanumeric(with Dash)
logical/Boolean
words
Data
numeric
Here is a list of examples of data to be put into a structure
Some of this data can have the logical? Boolean data type and some of it cannot.
Complete the following table by placing a tick in the box next to those items of
data that could use a logical/Boolean data type.
Items of data
Driving license ( yes or no )
Sex ( M or F)
Size( S,M,L,XL,XXL)
Airport code (PEK,ICN,YNT)
Car registration number
Data of purchase
Car type (manual or automatic)
Tick if data type if logical/ Boolean
*
*
x
x
x
x
*
Furl type ( diesel or petrol)
are you hungry?
is your name long or short?
*
x
x
Items of Data
Driving License(Y or N)
Size (S,M,L,XL)
Sex (M or F)
Airport Code (PEK, ICN, YNT)
Car Reg Number
Date of Purchase
Car Type (Manual/Automatic)
Fuel Type (Diesel/petrol)
Are you Hungry?
Is your name long or short?
Tick if Logical/Boolean
Not Logical/Boolean
Logical/Boolean
Logical/Boolean
Not Logical/Boolean
Not Logical/Boolean
Not Logical/Boolean
Logical/Boolean
Logical/Boolean
Not Logical/Boolean
Not Logical/Boolean
Question B
1 A luxury car rental firm keeps the details of the cars it rents out in a table. The
structure and contents of this table are shown below.
Reg-number
Make
Model
DB51 AML
Aston Martin
DB7
CAB 360M
Ferrari
360 Modena
GT X34 FER
Ferrari
355 Spider
MAS 12
Maserati
3200GTA
FG09 FRT
Porsche
911Turbo
M3 MMM
BMW
M3 Conv
T433 YTH
Jaguar
XK8
a Give the names of two fields shown in the above table
Year
2009
2008
2000
2001
2009
2010
2009
2009 2000
b Give the name of the field that should be chosen as the key field
jaguar
c Explain why the field to have chosen for your answer to part(b) should be
chosen as the key field
because other things in Makes column are cars but only Jaguar is an animal.
d How many records are there in the table
7
2 Most schools now use databases to store details about each pupil. The table
shows some of the field names and data types stored in one pupil database.
Field name
Data Type
Unique Pupil Number
Number
Firstname
Text/Alphanumeric
Surname
Text/Alphanumeric
First Line Address
Text/Alphanumeric
Second Line Address
Text/Alphanumeric
Postcode
Landline No
Text/Alphanumeric
Data Of Birth
Date
FreeSchoolMeals(Y/N)
Logical/Boolean
a Give the most appropriate data types for the following fields:
1.
Firstname Text/Alphanumeric
2.
Postcode numberic/Alphanumeric
3.
FreeSchoolMeals(Y/N) Logical/Boolean
b Give the names of three other fields that are likely to be used in this database
Sex, Age, Grade.
c Explain which field is used as the key field in the database and why such a field is
necessary.
UniquePupilNumber. Because it is the only unique things that will not be use for
two pupils.
d It is important that the data contained in this database is accurate.
Describe how two different errors could occur when data is entered into this
database.
Transcription Errors - where data copied from forms is misread.
Transposition Errors - where digits are incorrectly reversed when being entered
into da database
e explain how the errors you have mentioned in part(d) could be detected or
prevented.
you can fix transcription errors by verifying data after you enter it.
3 a Explain what is meant by a flat-file database
flat-file databases are of limited use and are only suitable for very simple
databases
b Explain what is meant by a relational database.
data is stored in several tables with links between the tables to enable the data in
the separate tables to be combined together if needed.
c Describe an application where a flat-file database would be suitable.
use to simple data storage and retrieval systems such as storing a list of names,
addresses, phone numbers.
4 Databases are of two types: flat file and relational
a Describe two differences between a flat-file database and a relational database.
relational database is more safety and all connect together easy to see and
understand, flat-file is more faster
b A dress hire company needs to store details of dresses, customers, and rentals.
They want to store these details in a database. Which type of database do you
suggest and give two reasons for your answer
Relational database. because flat-file database it only for simple data, but this
company needs to put in details. because it is dress company so the things like
dresses, customers and rentals is linked together, relational database is the kind
of database that all tables connected, indeed it can unconnected too.