Entity-Relationship Diagram, E-R Diagram ERD E-R (Entities)(Associations)(Data elements)


6.2 c.3


(Identifier)






6.2 c.12

(Primary Key) 6-3

E-R (Association)
(Degree of a Relationship) E-R
(Unary, degree one)
(Binary, degree two)

6.2 c.18
Ex.


1
1
N
1



(Minimum cardinality)(Maximum cardinality)
1(Mandatory participant)006-9b11

6-10b


6.3 c.3

6.3 c.4

6-26-1

6-1



6-16-2

4.6-16-26-4
6-4
B.
6-11

6.4 c.4

6.4 c.6

6.4 c.7


6.4 c.11

6.4 c.13
S
SSNMGRSSNSTARTDATEMGRSTARTDATE

6.4 c.17
DNUMBERDNO

6.4 c.18
6-12 PROJECT SUPPLIER PARTSUPPLYSUPPLIER SNAMEPROJECT PROJNAMEPART PARTNO SUPPLY QUANTITY SUPPLYSUPPLY PROJECT SUPPLIER PARTSUPPLY PROJNAME SNAME PARTNO QUANTITY

6.4 c.20


6.5 c.4


R A B R B A A B R.A→R.B A B A B B A A B A
B A A B AR.A→R.B

(Third Normal Form, 3NF)Boyce-Codd(Boyce-Codd Normal Form, BCNF)

6.5 c.11





6-10a 3NF

6-16

6-11a 3NF








Windows Windows Visual Basic (VBX) OLE (OCX) OLEOLE, DDE, DLL, VBX, OCX

6.6 c.3


6.7 c.3



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