3- Database - Relationship

8/9/2019 3- Database - Relationship

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Access 2003 1

DATABASE MANAGEMENTS y s t e m


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1- Basic Relationships

Basic RelationshipEckecjCabIRbePTdUcxageRkam

One-to-one ( TMnak;TMngBImYyeTAmYy)

One-to-many ( TMnak;TMngBImYyeTAeRcIn )

Many-to-many ( TMnak;TMngBIeRcIneTAeRcIn )

Relationships Tables

Prepared by Sann Sothearath


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Access 2003 3

One-to-one Relationship: mannyfa ral;

Record EdlmanenAkg Table mYyGacmanTMnak;TMngCamYynwg Record EdlmanenAkg Table epSgeTot)anEt

mYyKt;. elakGkEtCYbTMnak;TMngTinny One to One

Relationship

eTAtamkardak;kMhitNamYy dUcCabuKilmak;RtUvmanRbBnRsbc,ab;Etmak;Kt;.



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Access 2003 4

One-to-many Relationship: enAeBlEdlTMnak;TMng(Relationship) RtYv)anbegItrvag TablesBIrTables TaMgBIrRtUvEtman

Foreign key edIm,IeGayvaGacTak;TgKaenAkg Database mYy. RbsinebIForeign key enAminTan;rkeXIjenAeLIyenaH Column dsmrmmYyEdlCa Primary key n TableNamYyRtYveRCIserIsnigbEnmelI TableepSgeTotedIm,IeFIVCa Foreign key enAelI Table enaH. enAeBl one-to-

many Relationship RtUv)anbegIteLIgrvag Tables BIrtUvRCIserIsPrimary key xag ' one ' TableCa Foreign key edIm,IbEnmxag ' many '

Table.Prepared by Sann Sothearath


5/19

Access 2003Prepared by Sann Sothearath


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Many-to-many Relationship: kgTMnak;TMngBIeRcIneTA

eRcInenHminGacekIteLIgedaypal;rvagEntities

BIr)aneT luHRtaEtmanTable mYyeTottUv)anbegIteLIgedIm,IeGaymanTMnak;TMngeTA Tables

TaMgBIrehIyyk Primary key rbs; TablesTaMgBIr mkrYmKaeFIVVVCa Primary

key rbs;x n. kgTMnak;TMngBIeRcIneTAeRcInenaH Table min

RtUv)aneKbBalKaeT eRBaHebIeyIgbBalKaenaHvaminRtwmEtekItmannUv

TinnydEdlCan;Ka (Redundant data) enaHeTvaEfmTaMgeFVIeGayman

karBi)akRKb;RKgBtmannImYy enAkg Table enaHpg.



7/19Access 2003 7Prepared by Sann Sothearath


8/19Access 2003 8

Primary keys: Primary key Ca column mYyrWRkunColumns EdlkMnt;eGay Record nImYyman

lkNxusKa.

Foreign keys:CaColumnsEdlpl;nUv RelationshipeTAnwg Primary key rvag Entities epSg.

Primary Keys and Foreign Keys



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2- Create Relationships:munnwgbegIt Relationships

eyIgRtUvbiT Object EdlkMBugGnuvtn_eGayGs;TukEt DatabaseWindows bnab;GkGac

- cucelI Tool menu- cucelIRelationships...

- cucelI Relationships menu- cucelI Show Table



10/19Access 2003 10Prepared by Sann Sothearath


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c,ab;TaMg3 n Relationship



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Enforce Referential Integrity:ral;karbBal DataenAkg SubTable RtUveFVIkareKarBeTAnwg Data Edlmankg Main Table.vamantYnaTIsMrab;bgajnUvtMlRelationship

Cascade Update Related Fields:ral;karEkERb Data enAkgFields Primary Key

RtUv)aneFVIkarEkERbeTAnwgField Foreign Key

enAkg Sub Table. Cascade Delete Related Records:ral;karlub Data enAkg

Main Table RtUv)aneFIVkarlubral; Sub Table EdlmanTMnak;TMngKa.



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c,ab;TagbIn Join Type:



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1: For Example of Inner JoinStudent :Table Study: Table

StudentID

001

002

003

Name

A

B

C

StudentID

001

002

Subject

DB

Access

Word

Student Study: Select QueryStudentID

001

002

Name

A

B

Subject

DB

Access



15/19Access 2003

2: For Example of Outer Join LeftStudent :Table (Left) Study: Table (Right)

StudentID

001

002

003

Name

A

B

C

StudentID

001

002

Subject

DB

Access

Word


001

002003

Name

A

BC

Subject

DB

Access



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Access 2003

3: For Example of Outer Join RightStudent :Table (Left) Study: Table (Right)

StudentID

001

002

003

Name

A

B

C

StudentID

001

002

Subject

DB

Access

Word


001

002

Name

A

B

Subject

DB

AccessWord



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Access 2003 17

- cucelICreate ButtonvanwgbgajBIkarPab;Relationship



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cMNaMlkxNnkarPab;Relationship RtUvcaM)ac;man- TableTaMgBIrEdleyIgcg;Pab;RtUvmanField Name, Data

Type, Field PropertiesdUcKa

- Table TaMgBIrebImanTinnyRtUvmanTaMgBIrehIyebIsinC

Gt;RtUvGt;TaMgBIr

- RtUvkMNt;Primary Key enAelI TableEdlCaeKal b em



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karPab;RelationshipKWeKeFIVedIm,IeGayTables

manTMnak;TMngKa ehIyKYrcgcaMEdrral; karbegIt

Tables mincaM)ac;RtUvPab; Relationship ral;elIkenaHeT. eKPab;enAeBlEdlTableBIrbeRcInEdlman

TMnak;TMngKa .


Documents

3- Database - Relationship