Index

A

alias, entity names • 38 alternate key • 30 associative entity • 56

definition of • 89 attribute

avoiding multiple occurrences • 73 avoiding multiple usages • 71

avoiding synonyms and homonyms • 38 definition • 42

definition of • 20

definition using business terms • 41 derived • 76

in an ERD • 20 name • 37 rolename • 35

specifying a domain of values • 42 specifying a rolename • 43 validation rule in definition • 42

B

base attribute, definition of • 43 binary relationship, definition of • 58 business

glossary creating • 41 rule

capturing in a definition • 44 term

organizing • 41

C

CA ERwin DM

diagram components • 20 model advantages • 9

candidate key, definition of • 28 cardinality

definition • 48

in identifying relationships • 48

in non-identifying relationships • 50 notation in IDEF1X and IE • 48

cascade

definition of • 51 example • 54

characteristic entity, definition of • 89 child entity • 22

complete subtype relationships • 64 components, in an ERD • 20

D

data analyst, role of • 14 data modeler, role of • 14 data modeling

assertion examples • 25 benefits • 9, 11 definition of • 11 methodologies • 11 role of data analyst • 14

role of data modeler • 14 role of facilitator • 14

role of subject matter expert • 14 role of the manager • 14

sample IDEF1X methodology • 15 sessions • 13

use of verb phrases • 24 definition

attribute • 42

capturing business rules • 44 entity • 39

rolename • 43 denormalization

in the physical model • 87 dependency

existence • 32 identification • 32

dependent entity • 32 types of • 89

derived attribute definition of • 76 when to use • 76

designative entity, definition of • 89 discriminator, in subtype relationships • 62 domain, specifying valid attribute values • 42

E

entity

assigning a definition • 39 associative • 56, 89

avoiding circular definitions • 41

avoiding synonyms and homonyms • 38 characteristic • 89

child • 22

definition conventions • 39 definition description • 40 definition of • 20

definition using business terms • 41 dependent • 32

designative • 89 in an ERD • 20 independent • 32 name • 37 parent • 22 subtype • 62, 89 supertype • 62

entity relationship diagram creating • 20 definition of • 17 objective • 19 overview • 19

sample • 20 subject areas • 19

ERD • 16

exclusive subtype relationships • 65 existence dependency • 32

F

facilitator, role of • 14 first normal form • 69, 71 foreign key

assigning referential integrity • 51 unification • 43

foreign key attribute, rolename • 35 fully-attributed model • 15

definition of • 17

G

generalization

definition of category • 62 definition of hierarchy • 62

I

IDEF1X, origin of • 9 identification dependency • 32 identifying relationship • 33

cardinality • 48 IE, origin of • 9

inclusive subtype relationships • 65

incomplete subtype relationships • 64 independent entity • 32

inheritance hierarchy, definition of • 62 instance, definition of • 20

inversion entry • 31

K

key

alternate key • 30 inversion entry • 31 primary • 28

selection example • 28 surrogate • 28

key attributes • 28 key-based model

definition of • 17, 27 objective • 27

L

logical model, definition of • 16 logical only property • 87

M

manager, role of • 14 many-to-many • 23, 56 eliminating • 56 migrating, rolename • 35

N

naming attributes • 37 entities • 37

n-ary relationship • 56 definition of • 58

non-identifying relationship • 34 cardinality • 50

non-key attribute • 28 normal forms

summary of six forms • 68 normalization

avoiding design problems • 69, 71, 73, 74, 76 CA ERwin DM support • 82

completing • 80

denormalizing in the physical model • 87 first normal form • 69, 71

second normal form • 73 third normal form • 74, 76

O

one-to-many • 22

P

parent entity • 22 physical model

creating • 85 definition • 17

physical only property • 87 primary key • 28

choosing • 28

R

recursive relationship • 56 definition of • 60 referential integrity • 51

cascade • 51 definition of • 51 example • 54, 55

notation in a CA ERwin DM diagram • 52 restrict • 51

set default • 51 set null • 51

relationship

and dependent entities • 32 and independent entities • 32 complete subtype • 64 definition of • 22

enforcing cardinality • 48 exclusive subtype • 65 identifying • 33

in an ERD • 20 inclusive subtype • 65

incomplete subtype • 64 mandatory and optional • 50 many-to-many • 23, 56 n-ary • 56, 58 non-identifying • 34 one-to-many • 22

reading from child to parent • 24 reading from parent to child • 24 recursive • 56, 60

referential integrity • 51 subtype • 56

subtype (category) • 62 subtype notation • 65 verb phrase • 22

repeating data groups • 69 restrict

definition of • 51 example • 54

rolename

assigning a definition • 43 definition • 35

migrating • 35

S

second normal form • 73 session

planning • 13 roles • 14

set default, definition of • 51 set null

definition of • 51 example • 55

subject matter expert, role of • 14 subtype entity, definition of • 89 subtype relationship • 56

complete • 64 creating • 66 definition • 62 discriminator • 62 exclusive • 65 inclusive • 65 incomplete • 64 notation • 65 supertypes • 62

supertypes • 62

surrogate key, assigning • 28

T

third normal form • 74, 76 fully-attributed model • 17 key-based model • 17

transformation model • 15 creating • 85 definition of • 18

U

unification

avoiding normalization problems • 79 foreign key rolenaming • 43

V

validation rule, in attribute definitions • 42