Download to read offline
![Session
7:
INTRODUCING DATABASES
8
Primarykeyis used to
39
40
A Foreignkeyislinkedto the primary key of the same table. T/IF?
is acollection of related information.
41. A
Database can have only onetable. T/F?
13
42.Ifa
piece of data (field-value)is stored in two places in the database, then storage space is wasted
and changing the data in one place will not cause data inconsistency. T/F
A5
A
field can storegroup of values. T/E
44. Ina
relationaldatabase, two tables cannot have a common field. T/F
A
foreign key is the primary key ofanother table, T/E
6 Formsare used for searching data in table. T/E
Competency Based GQuestions
(a) Relational
4 Akshat wants to store a huge amount of information about his firm in adatabase. Which type of
table organization would be most suitable for this purpose ?
(c)Either Relational or Flat file
identify the reCord in a table.
(a) Inconsistency
(c) Standardisation
ihis type of storing dataat multiple locations is known as data
. Juan has stored the datarelated to his work in multiple files. He did not realise that samne data
related to an important thing was stored in three different files separately.
Ihis problem is known as data
(a) Inconsistency
(c) Standardisation
uanhasstored the data related to his work in multiple files. He did not realise that same data
related to an importarnt thing was stored in three different files separately.
mdOahuge problem for Juan when he modified the data inone file while forgetting to
update other files.
(b) He
wants to club fields in a unique way.
(b)Flat File
(C) He wants
to create a field having a special
(d) He wants
tocreate a
(d)Hierarchical
only those
(b) Redundancy
Wants to create a foreign key ín each table.
values which are
(d)None of these
30. ToSupport and help Juan, his brother's friend Prabhnoor has come. Heexplained the need and role
of
database in Such a case. So headvised himto create tables such that there should be a way to
Tecognise each row of the table uniquely. What does Prabhnoor mean by this way ?
(a) prinary
()composite primary
uniquely), then thatfield must be declared as
(b) Redundancy
(d) None of these
. While designing the database, Prabhnoor suggested that if in atablethere is afield which must take
141
value in it.
primary key in each table.
[CBSE Sample Paper Term I, 2021-22]
key.
part of a field inanother table, (where it can recognise the records
(b) altermate
(d) foreign
UNIT III:DATABASE MANAGEMENT SYSTEM](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-6-320.jpg)
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2002
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2002
(2
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2009
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[Delhi
2003
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[OD
2005
(2
marks)]
[Delhi
2006
(1
mark)]
[Delhi
2006
(2
marks)]
[Delhi
2007
(1
mark)]
[Delhi
2007
(L
mark)]
[Outside
Delhi
200S
(1
mark)]
[Delhi
2008
(2
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[Delhi
2008
(1
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[Delhi
2008
(1
mark)}
6.
How
are
fields,
record
and
a
table
related
to
each
other
?
Explain
with
the
help
of
an
example.
4.
Write
the
relationship
between
a
database
anda
table.
147
Y
S.
Disinguish
betweena
reCord
anda
field
in
a
table,
with
an
example.
S.
Wite
full
form
for
()
URL
(ii)
RDBMS.
Paid
?
Tecord
Consists
of
several
fields
including
AdmissionNo
(Admission
Number)
RollNo
(Roll
Number),
Name.
Which
field
Out
of
these
three
should
be
set
as
the
Primary
key
and
why
? A
table
named
School
(containing
data
of
students
of
the
whole
School)
is
created
where
each
13.
what
is
the
and
'Columns'
in
a
table
?
2.
Wite
any
two
advantages
of
using
database.
Full
1.
Define
the
terms:
Table
and
Field
in
the
context
of
Base.
0.
Give
any
one
use
of
database.
can
be
used
to
capture
data
on
screen.
A
database
package
allows
users
Junior
Full
Full
Junior
Member
Type
Define
forms.
What
is
the
need
of
using
them?
Each
record
is
made
up
of.
Complete
the
following
paragraph
using
the
words
provided. Barrv
runs
a
small
printing
company.
He
wants
to
store
details
about
his
clients
in
a
database.
Management
System.
REPORT,
RECORDS,
CRITERIA,
FORMS,
FIELDS,
TABLE,
DATABASE
1.
Define
Database
Management
System.
Write
one
example.
03/04/77
16/06/92
02/11/85
06/07/74
12/10/89
Date
of
Birth
UNSOLVED
EXAMINATION
QUESTIONS
Purpose
of
Database
(a)
relative
b)
referential
A
database
file
in
which
tables
are
linked
together
is
Ashish
d)
recorded
Charan
What
is
a
need
of
a
database
?
Faqir
Sandie
Jatin
Forename
Data
is
stored
in
tables
of
Use
each
word
only
once.
Ram
Singh
5.
Write
the
to
query
data
that
meet
Mirza
Smith
Puri
Surname
(c)
relational
07073
12027
16104
17171
07135
3.
Member
Number
Use
the
information
given
to
answer
questions:
Sesson
7:,
INTRODUCING
DATABASES](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-13-320.jpg)
![end
(of
se,
called
the
front
end
of
the
database.
However,
actual
work
is
doneb
by
the
The
users
work
on
a
database
using
the
interface
provided
to
them
uch,
as
wizards,
design
view
etc.).
The
interface
with
which
users
Work
is
X
per
the
user
instructions.
This
None
per
your
sele
(d)
None
of
these
(b)
Military
base
of
action.
selected
course
Do
as
per
your
server)
is
called
the
back
end.
STEP5
Database
Server
as
To
view
the
data
in
this
table
once
again,
double
click
on
its
name
and
it
will
show
you i
NFORMATION
G
Description
Figure
2.12
Table
as
part
of
the
database.
NOTE
HSQL
database
engine
your
table.
data
and
save
Enter
the
desired
the
database.
table
is
part
of
See,
the
created
Create
View..
S
Vse
Wizard
to
Create
Table..
Create
Table
in
Design
View.
AnvOIces
Window
Help
Fiqure
2.11
Insert
data
in
table.
12/10
2009
ShipDate
(c)
Database
component
(a)
Air
base
1.
O00
BASE
is
an
example
of
data
in
the
table.
12/10
09
InvorceDate
(i)
Ater
entering
and
saving
data,
you'll
be
taken
to
database
window
where
you
n See
voUr
newly
created
table
as
part
of
your
database
[see
Fig.
2.12
below].
Embedded
database
Reports
Forms
(Check
Point
Qvenes
Tables
Eile
Edit
Yiew
Insert
Tools
Invoice.odb-
OpenOffice.org
Base
|of Record
101
1201
1001
CustomerlD
IvoicelD
Eile
Edit
View
Inset
Ioos
Window
Help
previous
step,
it
took entry
screen
(see
Fig.
2.11
below].
takes
you
to
screen
as action.
As
we
chose
to
Insert
data
immediately
in
(vi)
Once
you
click
at
Finish
of
previous
step,
it
Invoces
Invoce-
OpenOffice.org
Table
Data
View
156](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-15-320.jpg)
![157
SeSSION
2:
CREATING
DATABASE
AND
TABLES
?
(b)
create
table
through
table
wizard
directlv
in
a
blank
sheet
and
save
it
as
table
(e)
(a)
and
(b)
all
(c)
enter
data
(d)
all
the
above
(d)
formula
bars
?
(c)
forms
(b)
queries
(a)
tables
(b)
A
date
field
(a)
A
customers
account
number
(d)
A
student
admission
number(d)
dbo
(c)
An
AutoNumber
field
(c)
odb
is
5.
The
detault
extension
of
OOo
BASE
database
(d)
Ctrl
+
D
(c)
Ctrl
+
A
6
The
shortcut
key
to
create
a
new
database
is
(b)
Ctrl
+
O
(a)
Ctrl
+
N
(d)
Ctrl
+
D
and
horizontal
Ctrl
+
A
(c)
-
The
shortcut
key
to
open
an
existing
database
is
(b)
Ctrl
+O
(a)
Ctrl
+
N
S.
A
table
is
a
set
of
data
elements
that
is
organized
using
a
model
of
vertical
(b)
Columns,
Rows
[CBSE
Sample
Paper
Term
I
2021-22]
(d)
Forms,
Reports
(a)
Rows,
Tables
(c)
Rows,
Columns
(d)
Entry
(c)
Field
Type (c)
Edit
menu
Ater
opening
a
database,
vou
can
create
tables
interactively
using
(b)
Tools
menu
(a)
Tables
specifies
the
type
of
data
that
may
be
stored
in
a
field.
(b)
Autovalue
(d)
Table
wizard
(a)
Autosave
)
A
database
can
have
muliple
obiects
like
table,
forms,
queries,
reports
etc.
9
1nere
can
be
multiple
primary
keys
in
a
table.
1.
State
True
or
False.
are
called
records
and
rows
in
tables
are
called
fields.
(iv)
A
be
(d)
Model
|CBSE
Sample
Paper
Term
l
2021-22]
(c)
Clients
(b)
Back-ends
12
Database
Servers
(a)
Front-ends
13.
Zoya
learnt
Create
a
table.
But
when
the
Base
started,
she
cancelled
the
dialog
of
ompetency
Based
Guestions
She
was
unable
to
create
tables.
Help
her
do
this
by
picking
up
the
database.
OOo
BASE
to
She
started
a
opening/creating
a
new
blank
database
or
open
an
existing
database.
Only
in
an
open
(a)
Zoya
Table
right
solution
from
the
options
b)
Zoya
must
either
create
database,
tables
can
UNIT
III:
DATA
BASE
MANA
SYSTE
Base
OOo
in
your
to
new
table
database
a
2
What
method
can
yOu
use
to
add
a
(a)
Use
Design
view
to
create
table
of
up
made
the
following
components
EXCEPT:
is
3.
A
BASE
database
key
a
4.
Which
of
the
following
fields
would
not
make
suitable
primary
(b)
base
(a)
oob
Tab
(üi)
Columns
in
tables
NULL.
primary
value
key
can
referred
are
to
as
about
database
tables.
She
has
enthusiastically
downloaded
Open
Office.
has
recently
Wizard.
She
must
download
Table
Wizard
also.
has
not
downloaded
given
below.
be
created.](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-16-320.jpg)
![(CBSEN
Or
1.
Discuss
various
types
of
nunericc
fields
that
you
can
have
in
BASE.
Which
field
type
is
tihe upe
?
Explain
any
three
data
types
in
OpenOffice
Base.
Time
J
Null
value
represents
a
legal
empty
value
in
a
database.
Soluen
3
Different
field
properties
that
can
be
set
are
:
Entry
Required,
Length,
Decimal
Places,
Default
value
and
Form example.
J
Special
datatypes
include
:
Yes/No,
Image,
Binary
and
Other.
J
Numeral
data
types
are
:
Tiny
Integer,
Small
Integer,
Integer,
Big
Integer,
Float,
Real,
Double,
Numenc
2
Decimal.
3
Date/Time
data
types
are
:
Date[DATE],
Time[TIMEJ,
Date/Time[TIMESTAMP].
3
tec
data
ypes
are
Tet
()
(CHAR],
Tet
(VARCHARJ,
Tet[VARCHAR-IGNORECASE]
and
GVARCHAR.
J
Maximum
length
of
all
text
type
field
is
2
GB.
J
BASE
datatype
have
these
categories:
Text,
Date/Time,
Numeral
and
Special.
much
iength
as
needed
by
the
contents
of
the
field.
3
Fxed
length
fields
allot
same
length
to
all
fields
irrespective
of
their
contents
whereas
variable
length
jielas
2u.
(c)
By
setting
field
property
Decimal
Places
(d)
By
setting
field
property
Entry
Required
(b)
By
setting
field
property
Default
Value
JA
table
can
be
created
or
edited
in
design
view.
(d)
Default
value
property
LET
US
REVISE
empiovee.
How
can
Isha
achieve
this
?
creating
table,
Isha
has
been
asked
to
ensure
that
'Charity
Cause'
field
never
goes
blank
ior
a 32
Isha's
office
is
a
progressive
office
where
each
employee
must
commit
to
a
charity
catuse
(b)
Length
property
value
int
these
fields.
a
Isha
should
change
the
field
type
of
Bonus
and
Salary
as
lext
type
and
type
Rs'
(a)
By
setting
field
property
length
(c)
Isha
should
use
Text
type
for
these
fields
so
that
commas
can
be
inserted
in
the
values
k
Isha
should
choose
the
field
format
for
Bonus
and
Salary
as
the
currency
forrma
look
stinct
s, that
the
clearlv
tell
about
the
money
value.
What
can
Isha
do
to
achieve
this
(Salary
and
Bonus)
should
(a)
Isha
cannot
show
two
number
fields
differently
from
others.
31
In
tables,
the
age
number
of
days,
salary
and
bonus
fields
have
the
sarne
data
type
ber
()
Decimal
places
property
(a)
Entrv
Required
property
policv
of
the
organisation,
minimum
guaranteed
yearly
Bonus
is
7500/-
Bonus
can
be
ever
depending
upon
the
performance
of
the
employee.
What
should
Isha
set
so
that
the
rniritr
30.
While
creating
tables
for
emplovees,
in
one
of
the
tables,
there
is
a
field
namely
Bonus
amount
of
bonus
is
automatically
inserted
in
the
Bonus
field
2
174
However,
the
boss
wants
the
field
storing
noney
values](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-24-320.jpg)
![UNIT
III:
DATABASE
MANAGEMENT
SYSTEM
Quantity
Purchased
(b)
ItemID
and
ItemName
can
act
as
the
primary
key.
[CBSE
Sample
Paper
2011,
TermI
Number
ItemD0P
Date
Number
Text
Text
a
field
or
control.
175
Quantity
Purchased
ItemDOP
ItemStock
ItemStock
Item
Name
(b)
Which
two
fields
can
act
as
the
Primary
Key
from
the
ab0ve
table
?
ItmelD
()
TNo,
TName,
DOB,
Address,
B
Salary.
Item
Name
(4)
Suggest
the
data
types
of
all
the
fields
ItemId
()
(a)
()
Look
at
the
table
called
"Item"
given
below
and
answer
the
question.
be
present
in
the
table
called
Teacherinfo.
Ijormation
of
the
teachers
teaching
in
the
institution.
Suggest
five
fieldnanmes,
which
you
think
must )
Pronita
is
a
programmer
in
an
institution
and
is
asked
to
handle
the
records
containing
personal
thev
can
be
entered
in
such
situations.
neld
but
user
does
not
have
any
value
to
enter.
Since
Null
values
are
legal
empty
values
in
BASE,
Ans.
Null
values
are
very
useful
while
entering
data
in
a
field
when
table
demands
data
for
the
Ans.
6.
Do
as
directed
:
and
hence
can
store
a
combination
of
date
and
time,
also
known
as
timestamp. times
only.
But
the
field
type
Date/Time[TIME
STAMP]
is
a
combination
of
both
Date
and
Time
types
Ans.
The
Date[DATE]
field
type
stores
the
dates
only
and
the
Time[TIME]
field
type
stores
the
5.
iVhat
is
the
significance
ofNull
values
?
4
Hxc
s
the
feld
type
Date/Tine
(TIMESTAMP]
different
from
Datel{DATE]
and
TimelTIME]
field
types? add
records
to
the
table,
they
can
either
accept
this
value
or
enter
the
name
of
a
different
house.
Pxample,
in
Student
table,
you
might
set
the
default
value
for
House
as
"Tagore
House".
When
users The
default
value
is
automatically
entered
in
a
field
or
control
when
a
new
record
is
created.
For
3
I17aat
do
you
understand
by
default
value
? should
be
used
when
purely
whole
numbers
are
to
be
stored
in
the
field. hle
numbers,
numbers
with
decimals,
fractional
numbers
etc.
On
the
other
hand,
INT
field
type NUMERIC
tield
tvpe
should
be
used
when
we
need
to
store
all
types
of
numbers
such
as
set
automatically.
nineteen
(19)
spaces.
Tt
also
has
an
auto
value
feature
that
fills
up
the
field
with
a
value
you i)
Bis
lnteger
(BlGINT|.
This
tield
accepts
integers
or
whole
numbers
with
a
fixed
length
of eN3s,
It
also
has
an
auto
value
feature
that
fills
up
the
field
with
a
value
you
set
tically.
1:
should
vOu
prekr
a
NUMERIC
fieldtype
over
INT?
(i)
Integer
|NT).
This
ield
accepts
integers
or
whole
numbers
with
a
fixed
length
of
ten
(10) of
five
(5)
spaes.
o)
Small
integer|S1A1INT,
This
field
accepts
integers
or
whole
numbers
with
a
fixed
length
three
(3)
spaces.
)
Tinv
Integer
|TININT).
This
field
accepts
integers
or
whole
numbers
with
a
fixed
length
of
CREATING
EDITING
TABLES
IN
DESIGN
VIEW
Ans.
In
BASE,
we
can
have
following
tvpes
of
Numeric
fields
Ans
The
default
value
is
used
to
specify
the
default
value
for](https://image.slidesharecdn.com/dbmapart1-250311091623-6ced896b/85/Data-base-managment-system-1254658543135-25-320.jpg)
Data base managment system 1254658543135
- 1. T Session1 Session 2 Stegs Session 3 ie'dstiect cr IntroducingDatabases esch cond Session 4 Chck here for table wizard Creating Databaseand Tables Select the sor fing otder tton unctered Creating/Editing Tablesin DesignView Performing Operationson Tables Selec sor-fe here Windowbelow Session 5 535eril System Session 6 Su0a'ertvame Database Management Address QueriesinBase Session 7 Session 8 StructuredQueryLangauge FormWizard Stess SadaA Eritt ReportWizard Arranne the ontrole on yOr forn Pheretnber Choose an arrangement
- 2. 1 11 Introduction e SSi O n Introducing Databases earhing Objectwes A database refers to a collection of related data and a database system is basically a computer based record keeping system. A database contains information about one particular enterprise It maintains any information that may be necessary to the decision-making processes involved in the management of that organization. L2 Dotabase Functioning A Database Functioning AA Designing a Database The intention of a database is that the same collection of data should serve as many appications as possible. Hence, a database is often conceived of as the repository o imformation needed for running certain functions in acorporation or organization. Sucn d database would permit not only the retrieval of data but also the continuous modification or data needed for control of operations. A How Database Works A Advantages of Databases Ihus session is going to discuss the basics of databases and their functioning. This discussio willlay foundation of BASE - the dbMS ofOpenOffice.org (O00)for you. stored in two separate files In a typical file-processing system, permanent records are stored in various files. A number of different application programs are written to extract records from and add records to the appropriate files. But this schemné has a number of major limitations and disadvantages, such as data redundancy (duplhcation of data), data inconsistency, unsharable data, unstandardized data, insecure data, incorrect data etc. A database management system is answer to all these problems as it provides acentralized control of the data. 128 DEF. to Database the refers collection of interrelated data and Database Managemen System (DBMS)is a compute that program database etfectively efficiently. Imanages d Forinstane, in a nesidential school, iftwofiles are being maintained - onefor school and another for hostel- it might create problems. As for the students wholive in hostel, their records ar and school file and hostel file. Now consider a situation, in whicha
- 3. A R B 138 Student Table Figure 1.7showsa relationship between twotables. 4. 7 9. Rollno 2 Name Rohit Kush Mehul Neha Surabhi heck Point (a) Address Relationshio on the basis of commo field rollno M.Ngr (a) Table A. Garg S.Ext. P. Ganj B. Ngr See. for each roll no. in student table, there exists a record in marks tabie also (a) Data Redundancy (C) Data Inconsistency Duplication of data is known as Data Redundancy D.0.B. (c) Data Inconsistency 12/10/92 18/02/93 Computer based record keeping system is knoWn as (a)CRKS - Computerized ReCord Keeping System (b) DBMS - Data Base Management System (c) DMS - Data Managemnent System (a) All of these 14/05/92 17/12/92 12/12/93 (b) Query Marks Table 5. Multiple copies of same data that mismatch, are knoWn as Rollno English (a)Prinary key (b) Candidate key 1 2 3 5 Fiqure 1.7 A Relationship betweentwo tables. A formal, presentable printed doCument that lists (a) Table 30 (b) Data Repentance (d) None of these (c) Report 5. A field that uniquely identifies records in the table is known as 35 30 (b) Data Repentance (c) Unique key 26 (d) None of these (c) Table 40 INFORMATION TECHNOIo datain formatte (b) Query (c) Report Namedcollection of fields which represent aconplete (a) Field (b) Record Maths 40 A statement that gives you filtered data according to your conditions and (a) Table (b) Query (c) Report Aninterface inuser-defined layout that lets users view, (u) Table (b) Query (c) Report 50 30 36 46 unit of information (d) Form A storage container storing data pertaining to simple object, subject or PurpOse is known as Science 40 42 35 28 40 (d) Special key IIT 32 43 is called (d) None of these 29 32 38 (d) Form in tables, knOwn enter or change data (d)Form Way is known as (d) Form Specitications,iscalled
- 4. INTRODUCINGDATABASES ina tableis also knoWnas : (a) A reCOrd (a)Table I1 Whih of the following hoids a single piece of data ? 2 What isthe correct definition of primary key ? i)Thefirstfield ina table : Whatisthe coorrect definition of foreign key ? (0)A tield that contains unique datain each record. ) The tield which we will usse to search with. ()A field which contains numbers only. The common field of two tables. i) The field same as primary key. (b) Afieldthat contains unique data in each record. (a) Alternate key (b) A field (c) Foreign key (b) Record : When a primary key Contains more than one field, it is known as (a) Foreign key lä) Afield that stores v values coming from primary key of another table. () Datatype : Which is not true for a database file? : What is used to uniquely identify each record in a table ? (a) Each record may contain several fields (b) Fields are organized in columns i)Data types have to be declared in advance la) Each field may contain several records la) Purpose of database (c) Field needed (a) Lists (o) Tables (c) A data typ (c) Field While designing a database, we should keep in mind a) It can print reports. What are the main building blocks of a database ? retrieves data related toits queries. (a) Field properties (a) it provides a relationship between integers. (bj it consists of Separate tables of related data. Data should be organized intotables based on : 0Character lengths a) All of these (b) Candidate key (b} Subjects associated with the real-data (d) Comnposite key Which offthe following describes a relational database ? (b) Field (d)Primary key (b) Tables required (d) Allof them (b) Queries (d) Reports (d) A tupie (d) Form UNIT:III : DATABASE MANAGEMENT SYSTEM 139
- 5. R T B 140 21. Which ofthe following best describes a query ? (a) A queryenables people to enter or view data in your database easilv ()A query summarizes and prints data. (c) A query filters data from a database based on a criteria. (d) Allof these 22. Which of the following best describes a form ? (a) A form enables people toenter or view data in adatabase easily. (b) A form summarizes and prints data. (c) A form filters data from a database based on acriteria. (d) Allof these 23. Which of the following best describes a report ? (a) A report enables people to enter or view data in a database easily. (b) A report summarizes and prints data. (c) A report filters data from a database based on a criteria. (d) Allof these 24. A database table shouldalways contain (a) images (c) lots of ready made queries 25. Data in a database is stored in a (a) table (a) field (a) record 26. A collection of data which is stored in alogical structure is known as a (a) datatbase 27. One piece of data about a single person or thing is known as a (a)table (b) query (a)query (b) database 28. Allof the information about one person or one thing is known as a (b) field (c) file (b) file 29. Acollection of records on aparticular topic is stored as a Create (b) lots of records (d) a key field called a (c) report (b) record key. (c) record (b) report databases. (c) field tohelp ensure data integrity. 31 To organize the different tables of related data, a relational INFORMATION TECHNOLOGA) (c) folder 30. Tofind a particular record or set of records in a database you would use a (c)table (d) search (d) table (d) database 32. To display data in a specific format or distribute a summary of data, 33. To get data input from user in a well-organized,formatted way on screen, 34. In the database view of a relational database, a row of information is called a (d) record (d) field 35. To control how information is entered into adatabase, programmers and database administrators (d) relationship is used. are created. 36. In arelational database, a common fieldthat linkstwotablesin arelationshipbut not a| primary key is areused. 37. The database use common fields to createlinks between tables, Thus Such databases are called a
- 6. Session 7: INTRODUCING DATABASES 8 Primarykeyis usedto 39 40 A Foreignkeyislinkedto the primary key of the same table. T/IF? is acollection of related information. 41. A Database can have only onetable. T/F? 13 42.Ifa piece of data (field-value)is stored in two places in the database, then storage space is wasted and changing the data in one place will not cause data inconsistency. T/F A5 A field can storegroup of values. T/E 44. Ina relationaldatabase, two tables cannot have a common field. T/F A foreign key is the primary key ofanother table, T/E 6 Formsare used for searching data in table. T/E Competency Based GQuestions (a) Relational 4 Akshat wants to store a huge amount of information about his firm in adatabase. Which type of table organization would be most suitable for this purpose ? (c)Either Relational or Flat file identify the reCord in a table. (a) Inconsistency (c) Standardisation ihis type of storing dataat multiple locations is known as data . Juan has stored the datarelated to his work in multiple files. He did not realise that samne data related to an important thing was stored in three different files separately. Ihis problem is known as data (a) Inconsistency (c) Standardisation uanhasstored the data related to his work in multiple files. He did not realise that same data related to an importarnt thing was stored in three different files separately. mdOahuge problem for Juan when he modified the data inone file while forgetting to update other files. (b) He wants to club fields in a unique way. (b)Flat File (C) He wants to create a field having a special (d) He wants tocreate a (d)Hierarchical only those (b) Redundancy Wants to create a foreign key ín each table. values which are (d)None of these 30. ToSupport and help Juan, his brother's friend Prabhnoor has come. Heexplained the need and role of database in Such a case. So headvised himto create tables such that there should be a way to Tecognise each row of the table uniquely. What does Prabhnoor mean by this way ? (a) prinary ()composite primary uniquely), then thatfield must be declared as (b) Redundancy (d) None of these . While designing the database, Prabhnoor suggested that if in atablethere is afield which must take 141 value in it. primary key in each table. [CBSE Sample Paper Term I, 2021-22] key. part of a field inanother table, (where it can recognise the records (b) altermate (d) foreign UNIT III:DATABASE MANAGEMENT SYSTEM
- 7. leaes takens, CL. IWP. PL etc. (CL -Casual Leaves, LWP -Leaves Without Pay, PL -l Privilege ves taining to the attendance of employees eg, employees' no., monthis, years, no. of days Uorkvd nbhr enployer name, desig1natten, department, grade, basic etc. Similarly, Attendance table may Contain data pe example, an employee table may contain all information pertaining t0 an enplye?e A table is a storage container that stores data pertaining to single object, subject o rpose Ans. In a database management system, various types of objects together manag SVstem. Tables are one of them. 3. What do you iu Hderstand by tables in a database management system? One can analyze or print data in a specific layout using Reports. one can find and retrieve just the data, which is required using Queries " one can view, add and update table data using Forms one can divide one's data into separate storage containers called Tabies manage databases. With BASE, one can manage all information stored in a .odb tie:Within the file, Ans. BASE is a database management system part of OpenOffice.org. It otters mny 2. Write a short note on OOo BASE functiwming. (v) Enhanced Data Security. (it) Starndardization (ui) Data Consistency (i) Data Sharing Controlled Redundancy required. The centralised storage facilitates many advantages like: The database systems store data centrally at one place wheretrom all applications can ge he Maageent Sstems (DBMS) Ans. A database is a collection of logically related data. () terng sy ste. 1. What is database ? What is its significance? Time A report is ar ejective way to present date in a printed format. It is a formal presentable document about data Afom is an interfae in user speciffed layout that lets users view, enter, or change data directiy in the tobie Soluion A quey is a statement that gives you filtered data avrding to your conditions and specifications. A primary key is a field that unique identifes the reords in a tabie. A tabie refers to a stoage ONtairer storing data pertaining to single objert. subject or purpose. Dupticatior of data is known as data redundany. program that menages a database etethe and ethtenty. DatahaR eÉst the othon of inteetet ta ani Database stem is hasiall & te baset ra 3 BASE ofers mary features ke tables. forms. queries and reorts to manage date. 3 3 LET US REVISE 3 3 5 JA databzse 142
- 8. MANAGEMENT SYSTEM b) Which Department has maxmunt enmployees and what are theií Payroll Numbers? 0) The Job Title of the employee with Payroll Number M421 is ? Purchasing Clerk 143 Factory Manager Sales Rep Secretary Accountant Job Title 9,11,000 18,17,000 11,19,000 19,500 Payroll Clerk 23,11,000 14,15,000 9, 29,000 9,00,000 20),000 Price (Rs.) 39,000 24,000 18,500 35,000 9 Finance department their Payroll Numbers are : A621, M502. Salary (Rs.) 6289 XF 54 1233 CD 33 B G8347 DD B4978 SB A5526 BFK 297 M134 VSE 648 H219 W815 M421 M502 A621 Number Payroll 1.2 1,4 1.6 1.2 1.4 2.0 1.8 Purchasing Factory Human Resources Size of engine Registration Sales Finance Department Finance 0) How many felds are there in this part of the database? 4) How many records are there in this part of the database ? to mininize redundancy. Megane Model Clio Jetta Raunag Singh Firstname Polo Golf Wahadevan Shruthi Zafira Vectra James lia Fiza Ahmed Msder the following database. Ans. (a) 7 (seven) (b) 5 (five) Renault Renault Lastname Volkswagen Volkswagen Volkswagen Make ns. Walker Opel Mahotra Opel Sen Shafia i Th managCT of a car shoæroonn USCS a database to store data about cars he sclls. This is part of the database. OpenOffice.org is a relational database.n a relational database, data is stored in multiple tables linked via common fields e.g., BASE of Ans. In a fat . databasc, all the data is stored in a single file c.,a spreadsheet. 4 Mhat is the differene betueen a fatt database and relational database ? ike redtuced redundancy, standardization and data integrity. Therefore, tables, provide a way to store related data together under one roof, taking care of things Both these tables reside in single database as both of them are related to single object called INTRODUCING DATABASES tables are maintained enmployee. Two
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- 11. 145 MANAGEMENT SYSTEM 18. How is a foreign key different from a primary key ? 17. What is a composite primary key ? 6. What is a foreign key? 15. Name different types of keys in a table. 14. How iS a relational database different froma flat database ? enterprise? 13. Name some popular DBMSs. 12. What are the different steps involved in 'Designing a Database' ? jorms, queries and reports in BASE? 11. What are 10. What are advantages of DBMS Over normal file system? 9. What is a DBMS? What Importance does it have for an 8. What is the need of setting relationships between tables?Wnat iS a Primary key? What is an alternate key? 0W do you interpret 'Field' in context of a DBMS? Write the basic features of OOo BASE? Write the key features of a DBMS? What do you understand by Data Inconsistency? 3. What is meant by Data Redundancy? 3. Aosignment 4. 1. What is Database ? 2. Table A storage container storin8 data pertaining to a single object, subject or purpose. Ronort A formal, presentable printed document that lists data in a formatted manner. Relational Database Management Systemn RDBMS Query A statement that gives filtered data according to specified conditions. Primary key A field that uniquely identifies records in a table. Form An interface in user-specified layout that allows users to view, enter or change data directly in table. Foreign keyA non-key field of a table that refers to the primary key of another table. Data Inconsistency Multiple mismatching copies of same data. Data Redundancy Duplication of data. DBMS A computer program that manages a database effectively. GLOSSARY Data Base Management System DBMS. Data Base Collection of interrelated data. Composite Primary key A primary key having a combination of more than one field. Session 7 : INTRODUCING DATABASES
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- 15. end (of se, called the front end of the database. However, actual work is doneb by the The users work on a database using the interface provided to them uch, as wizards, design view etc.). The interface with which users Work is X per the user instructions. This None per your sele (d) None of these (b) Military base of action. selected course Do as per your server) is called the back end. STEP5 Database Server as To view the data in this table once again, double click on its name and it will show you i NFORMATION G Description Figure 2.12 Table as part of the database. NOTE HSQL database engine your table. data and save Enter the desired the database. table is part of See, the created Create View.. S Vse Wizard to Create Table.. Create Table in Design View. AnvOIces Window Help Fiqure 2.11 Insert data in table. 12/10 2009 ShipDate (c) Database component (a) Air base 1. O00 BASE is an example of data in the table. 12/10 09 InvorceDate (i) Ater entering and saving data, you'll be taken to database window where you n See voUr newly created table as part of your database [see Fig. 2.12 below]. Embedded database Reports Forms (Check Point Qvenes Tables Eile Edit Yiew Insert Tools Invoice.odb- OpenOffice.org Base |ofRecord 101 1201 1001 CustomerlD IvoicelD Eile Edit View Inset Ioos Window Help previous step, it took entry screen (see Fig. 2.11 below]. takes you to screen as action. As we chose to Insert data immediately in (vi) Once you click at Finish of previous step, it Invoces Invoce- OpenOffice.org Table Data View 156
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- 22. (b) A field that uniquely identifies each record is called a 21. Fill in the blanks |CBSE Sample Puper 2011| (d) None of the above (c) To enter lookup data that the field should refer to (b) To define the data type applied to each field within the table (a) To describe the data that should be entered in each field 20. What is the purpost of the description column in Table Design View ? |CBSE Sample Paper 2011 (d) A student admission number () An AutoNumber field (a) A customers account numnber 19. Which of the following fields would not make a suitable primary key ? (b) A date field (a) Text (b) Number (d) All the above [CBSE Sample Paper 2011) (a) Age in vears (b) Date of Birth (c) Age in days (a) Age in months [CBSE Sample Paper 2011 One of these is required? Out of the following which one is most appropriate data field in context of employee table u (a) Data (2) Data (b) Type l6 What identifies the contents of a field ? (b) Field Value The organizing of data according to text, number, currency, date/time, (c) Date type (c) Field name (d) Table name (d) Data structure (a) Tiny Integer (b) Small Integer The number 487.52 should have a field size of : (c) Integer etcis called(d) Big Integer (a) Field Name (b) Data Type (c) Description (d) Field Size optional2 13. (2) record (b) long integer (c) column (d) field table, each DD will be entered as a : a 11. A BASE database is made up of all the following components EXCEPT: (c) forms (a) tables (b) queries (d) formula bars (a) Format (b) Entry Required (c) Default Value (d) Length be left enptu ? of (d) all of the above (e) none of these (a) Yes/No (6) Image (c) Binary field (b) Real 8. (d) Float (a) Integer(lNT) (c) Small Integer (SMALLINT) 172 INFORMATION TECHIOIOGty tield is knoWn (a) The type that dictates what Sort of data can be stored within What data tvpe should you choose for a zip code field in a table ? (c) Varchar When vou define a field for a table, which of the following parameters does BASE always consider up d 12 Suppose vou like to set table in BASE to monitor your growing collection of DVDs. In that 10. Which the tollowing field properties ernsure "data that cannot be skipped in the field" or "field cannt Whichof the following types cannot 9, allow integers or numbers or text in them ? Whichof the following field types can represent upto 5 digits numbers?
- 23. II : (b) Time (C) nip (a) Date tie ffeld ? in tIhe Otti held that can store the iate and the tendance of the table about 29. Isha has nOW SOme experience fCeating >f nty ployees. Alon witlh othr lotail, the tbl< shou lo hav nd updatiny tablS. er nus nsCd he t Cnàts What hoelt bo tlhe icli VPe tr his s theld to an existine taaole in not alloe iit Be. (c) (6) She shoald Open the table in Design SHtteSna should delte tine old table an create A ne aiready created tabie ? ohe tield. She ha alrnv nter n te oCUrds.It add (a) Tabie Wizard eating tables (e) Design Viem tO Rt tbl I * Sa ova´s friend, has also learnt about -ompetency Based QJEstiOns () Date () Tìme data wpe sos dat and tìme walu tK tl« (Oalidation Rule () aption («) Dault Which ield pVpert b usd tO aChi thìs In the datashvt ie oi th Studont talle, tlh S«iera d.teir tilu ehis tr iis ()Alt ()TabeVie (a) ataheVi Alr that qets nterSn Datas dispav iavot Length esutt Vali Numbe Dlaces toe CRTG = 173 tO delet alI the rerords in the talbl oet lhu mI n«w ticlu SSruly created her irst tnbl, But while ntri dat li Ealis«i tit e tNUt t interacivei sne sInou ld Na te the tables tO and other settings, What shoul sn ns Dntaass. he iS a O
- 24. (CBSEN Or 1. Discuss various types of nunericc fields that you can have in BASE. Which field type is tihe upe ? Explain any three data types in OpenOffice Base. Time J Null value represents a legal empty value in a database. Soluen 3 Different field properties that can be set are : Entry Required, Length, Decimal Places, Default value and Form example. J Special datatypes include : Yes/No, Image, Binary and Other. J Numeral data types are : Tiny Integer, Small Integer, Integer, Big Integer, Float, Real, Double, Numenc 2 Decimal. 3 Date/Time data types are : Date[DATE], Time[TIMEJ, Date/Time[TIMESTAMP]. 3 tec data ypes are Tet () (CHAR], Tet (VARCHARJ, Tet[VARCHAR-IGNORECASE] and GVARCHAR. J Maximum length of all text type field is 2 GB. J BASE datatype have these categories: Text, Date/Time, Numeral and Special. much iength as needed by the contents of the field. 3 Fxed length fields allot same length to all fields irrespective of their contents whereas variable length jielas 2u. (c) By setting field property Decimal Places (d) By setting field property Entry Required (b) By setting field property Default Value JA table can be created or edited in design view. (d) Default value property LET US REVISE empiovee. How can Isha achieve this ? creating table, Isha has been asked to ensure that 'Charity Cause' field never goes blank ior a32 Isha's office is a progressive office where each employee must commit to a charity catuse (b) Length property value int these fields. a Isha should change the field type of Bonus and Salary as lext type and type Rs' (a) By setting field property length (c) Isha should use Text type for these fields so that commas can be inserted in the values k Isha should choose the field format for Bonus and Salary as the currency forrma look stinct s, that the clearlv tell about the money value. What can Isha do to achieve this (Salary and Bonus) should (a) Isha cannot show two number fields differently from others. 31 In tables, the age number of days, salary and bonus fields have the sarne data type ber () Decimal places property (a) Entrv Required property policv of the organisation, minimum guaranteed yearly Bonus is 7500/- Bonus can be ever depending upon the performance of the employee. What should Isha set so that the rniritr 30. While creating tables for emplovees, in one of the tables, there is a field namely Bonus amount of bonus is automatically inserted in the Bonus field 2 174 However, the boss wants the field storing noney values
- 25. UNIT III: DATABASE MANAGEMENT SYSTEM Quantity Purchased (b) ItemID and ItemName can act as the primary key. [CBSE Sample Paper 2011, TermI Number ItemD0P Date Number Text Text a field or control. 175 Quantity Purchased ItemDOP ItemStock ItemStock Item Name (b) Which two fields can act as the Primary Key from the ab0ve table ? ItmelD () TNo, TName, DOB, Address, B Salary. Item Name (4) Suggest the data types of all the fields ItemId () (a) () Look at the table called "Item" given below and answer the question. be present in the table called Teacherinfo. Ijormation of the teachers teaching in the institution. Suggest five fieldnanmes, which you think must ) Pronita is a programmer in an institution and is asked to handle the records containing personal thev can be entered in such situations. neld but user does not have any value to enter. Since Null values are legal empty values in BASE, Ans. Null values are very useful while entering data in a field when table demands data for the Ans. 6. Do as directed : and hence can store a combination of date and time, also known as timestamp. times only. But the field type Date/Time[TIME STAMP] is a combination of both Date and Time types Ans. The Date[DATE] field type stores the dates only and the Time[TIME] field type stores the 5. iVhat is the significance ofNull values ? 4 Hxc s the feld type Date/Tine (TIMESTAMP] different from Datel{DATE] and TimelTIME] field types?add records to the table, they can either accept this value or enter the name of a different house. Pxample, in Student table, you might set the default value for House as "Tagore House". When users The default value is automatically entered in a field or control when a new record is created. For 3 I17aat do you understand by default value ? should be used when purely whole numbers are to be stored in the field. hle numbers, numbers with decimals, fractional numbers etc. On the other hand, INT field type NUMERIC tield tvpe should be used when we need to store all types of numbers such as set automatically. nineteen (19) spaces. Tt also has an auto value feature that fills up the field with a value you i) Bis lnteger (BlGINT|. This tield accepts integers or whole numbers with a fixed length of eN3s, It also has an auto value feature that fills up the field with a value you set tically. 1: should vOu prekr a NUMERIC fieldtype over INT? (i) Integer |NT). This ield accepts integers or whole numbers with a fixed length of ten (10) of five (5) spaes. o) Small integer|S1A1INT, This field accepts integers or whole numbers with a fixed length three (3) spaces. ) Tinv Integer |TININT). This field accepts integers or whole numbers with a fixed length of CREATING EDITING TABLES IN DESIGN VIEW Ans. In BASE, we can have following tvpes of Numeric fields Ans The default value is used to specify the default value for