PATTY’S  DAYCARE  CENTRE

‘The 4 SQLers'Emma Berlese 839160

Alberto Bragagnolo 832517Nicholas Righetto 855524Marco Cersosimo 837354

Information Systems and NetworksA.Y. 2014/2015Prof. Albarelli

A  parent  registers  their  child  or  children  at  the  school  using  a  registration  form  and  can  submit  more  than  one  registration  form

Each  room  in  the  daycare  is  assigned  an  age  group    (Infants  under  1  year  of  age  ;  Toddlers  from  1  to  3)

A  child  is  assigned  to  a  room  based  on  their  age  and  availability  of  space  

KEY  POINTS

A  room  may  be  assigned  one  or  more  employees  

An  employee  can  only  be  assigned  to  one  room  

The  minimum  number  of  employees  for  a  room  is   determined   by   the   number   of   children  assigned   to   the   room   and   the   child:staff   ratio  identified  by  the  government

ROOMSEMPLOYEES

AGE  GROUPCHILDREN

SPECIAL  NEEDS

Goes  in

Belongs  to

RelaPveSSN

Address

HomeContact

MobileContact

RelaPon

AuthorContact

AuthorPickUp

ID_Needs

Name Sex DateOfBirthChild_ID

AgeGroup_ID

StartDate

GovRaPo

RoomID Capacity

Employee_ID

Name

WeeklyHours

MonthlyWage

Entity-­‐Relationship  Diagram

Contains

HasRELATIVES

Is  related  

to

Name

RelaPveSSN

Address

HomeContact

Is  related  

toCHILDREN

AuthorPickUp

AuthorContact

RelaPon

RELATIVES

MobileContact

Name

Sex

DateOfBirth

Child_ID

RELATIVES  -­‐  CHILDREN

Relationship: Many to many

The parent that fills out the registration is one, but he or she may also indicate other relatives (or even friends) that:

• Have a certain relation with the children (uncle, sister, grandmother, etc…)

• Can be authorized to pick up the children

• Can be contacted in case of need

Name

‘Is Related to’ attributes:

(Relative_SSN, Child_ID, Relation, AuthorPickUp, AuthorContact)

Type:Relation: TEXTAuthorizationPickUp: BOOLEAN, AuthorizationContact: BOOLEAN

Relatives’ attributes:

Relative_SSN: VARCHAR (16)Name: TEXTAddress: TEXTHomeContact: VARCHAR (20)MobileContact: VARCHAR (20)

Relative_SSN Name Address HomeConta

ctMobileConta

ct

BNCFRN459F3.. Francesca Bianchi

Via Roma 1, Mestre…. 003941234293 3345938209

VRDVTR824E2.. Vittorio Verdi Piazza Maggiore 65/A, Padova… 003942983730 3470921092

RSSMRC435T4.. Marco Rossi Via Pio X 45, Vicenza… 003942504048 3459201919

NRICHR826R2.. Chiara Neri Via della libertà 30, Mestre… 003944492839 3338893234

Relative_SSN Child_ID Relation AuthorPickUp AuthorContact

BNCFRN459F3.. 0001 Mother 1 1

VRDVTR824E2.. 0002 Father 1 0

RSSMRC435T4.. 0003 Uncle 0 1

NRICHR826R2.. 0004 Cousin 0 0

‘RELATIVES’  and  ‘IS  RELATED  TO’

Relative_SSN Child_ID Relation AuthorPickU

pAuthorConta

ctBNCFRN459

F3..0001 Mother 1 1

VRDVTR824E2..

0002 Father 1 0

RSSMRC435T4..

0003 Uncle 0 1

NRICHR826R2..

0004 Cousin 0 0

Is  related  

to

AuthorPickUp

AuthorContact

RelaPon

RELATIVES CHILDREN

RELATIVE  TYPE

Rel_type

RELATIVE  TYPE  OPTIMIZATION

Is Related to (Rel_SSN, Child_ID, Rel_Type, AuthPickUp, AuthContact

Relative Type (Rel_type)

Name Sex DateOfBirthChild_ID

CHILDREN SPECIAL  NEEDS

ID_Needs

CHILDREN  –  SPECIAL  NEEDS

Has

Relationship: Many to many

The parent fills a registration form where they indicate the informations of the child: name, sex, date of birth

• In the same form, they can also signal the child’s special needs (intolerances to food, diseases or other problems)

Children  (ENTITY  SET):  

Child_ID:  INT  or  VARCHAR(16)  Name:  TEXT  Sex:  CHAR  DateOfBirth:  DATE  

Children  (Child_ID,  Name,  Sex,  Date  of  Birth)

‘Children’,  ‘Has’  and  ‘Special  Needs’

Special  Needs      (ENTITY  SET)  

Needs_ID:  STRING

RELATIONSHIP  

Has  (Child_ID,  Needs_ID)

Child_ID Name Sex DateOfBirth

0001 Dan Peterson M 02/01/1992

0002 Andrew Greg M 03/04/1992

0003 John Hopkins M 05/06/1992

0004 Angela Merkel F 07/08/1992

CHILDREN-­‐AGE  GROUP

AGE  GROUP

CHILDREN Belongs  to

Name Sex DateOfBirthChild_ID AgeGroup_ID StartDate

GovRatio

Relationship: Many to one

Belongs to ( Child_ID, AgeGroup_ID)

Children ( Child_ID, Name, Sex, Date of Birth, AgeGroup_ID)

ROOMS-­‐AGE  GROUP

ROOMS

RoomID Capacity

AGE  GROUP

AgeGroup_ID

StartDate      GovRatio

Contains

Relationship: Many to (at most) one

• The ROOMS entity is composed of two attributes: RoomID (primary key) and capacity.

• RoomID will be a univocal attribute of the room and each room can have at most 1 age group assigned. This is to keep into account that not all the rooms may be used

• Capacity attribute is also important because a child is assigned to a room also considering its availability of space

• The AGE GROUP entity is shaped by the AgeGroup ID (primary key), StartDate, GovRatio attributes.

• AgeGroup ID attribute is needed to distinguish children between INFANT ( < 1 year) and TODDLERS (1-3 years).

• GovRatio attribute informs us about how many children inside the room need the supervision of one employee according to the governmental requirement.

• StartDate attribute is necessary to define the date of birth of children that belong to the age group

ROOMS-­‐AGE  GROUP

‘ROOMS’  AND  ‘AGE  GROUP’

Room_ID Capacity

1 10

2 15

3 20

AgeGroup_ID StartDate GovRatio

Infant 2014/09/28 5

Toddler 2012/09/28 8

Rooms attributes:

Room_ID : STRINGCapacity : INT

Age Group attributes:

AgeGroup_ID : TEXTStartDate : DATEGovRatio : NUMBER

ATTRIBUTES  OF  ‘CONTAINS’

Room_ID AgeGroup_ID

1 Infant

2 Toddler

3 Toddler

Contains ( Room_ID, AgeGroup_ID)

Rooms (Room_ID, Capacity, AgeGroup_ID)

Contains

Attributes: Room_ID : STRINGAgeGroup_ID : TEXT

EMPLOYEES  -­‐  ROOMS

EMPLOYEES

Employee_ID

Name

WeeklyHours

MonthlyWage

Goes  in ROOMS

RoomID Capacity

Relationship: Many to (exactly) One

• Each employee can only be assigned to one room.

• The employee is identified by an unique ID, and by other attributes that are useful for the working relationship such as name, monthly wage and weekly hours.

• The rooms are identified by an unique ID and by the availability of space that they offer.

Employees’ attributes:

Employee_ID: STRING Name: TEXT Weekly Hours: INT MonthlyWage: DECIMAL

(Employee_ID, Name, MonthlyWage, WeeklyWage)

Employee_ID Name WeeklyHours Monthly wage

BNCLUS459F3.. Luisa Bianchi 20 600,00

SRRFSC824E2.. Francesca Sarri 40 1200,00

RSSSAR435T4.. Sara Rossi 40 1200,00

Rooms attributes:

Room_ID: STRING Capacity: INT

(Room_ ID, Capacity)

Room_ID Capacity

1 10

2 15

3 20

Goes in (Employee_ID, Room_ID)

‘Employees’  and  ‘Rooms’

(Employee_ID, Name, MonthlyWage, WeeklyWage, Room_ID)

Thank  you  for  your  attention!