A simplified version of Handnote of T-Form ER Data Modeling E-version. To the introduction of T-Form ED Method for beginners.

1. T-Form ER DataModeling
HandNote (a Simplifier Version)
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S.Toriyabe

2. NOTATION
T-Form ER Data Modeling
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3. Notation
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 T-form ER Data Modeling incorplated the notation of the Superset/Subsets.
Superset
Header
Details

4. Notation
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 Header and Details
Superset
(Entity Name here)
Header
Details

5. Notation
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Superset
Subset
Subset
 Superset / Subset
Superset
Classification
Subset
Subset
The Superset subsets of Diference
The Superset Subset of isomorphic
Classification

6. Notation
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ENTITY RECURSIVE
 Recursive

7. Notation
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RESOURCE RESOURCE
QUASI-EVENT
 Quasi Event

8. Notation
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EVENT EVENT
MAPPING LIST
 Mapping List

9. Notation
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RESOURCE VIRTUAL ENTITY
EVENT VIRTUAL ENTITY
 Virtual Entity

10. Notation
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RESOURCE ENTITY ROLE
EVENT ENTITY ROLE
 Entity Role

11. Notation
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0 or 1 From１ to Many
 Cardinality Constraints
The Symbols of cardinality Constraints

12. Notation
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Entity Name
Identifier
Reuse_1(R)
Reuse_2(R)
・
・
・
Reuse_n(R)
Attribute_1
Attribute_2
・
・
・
Attribute_n
EntityType
 The position of denotes

13. Notation
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 E: EVENT
 R: RESOURCE
 VE: VURTUAL ENTITY
 ER: ENTITY ROLE
 TS: QUASI ENTITY
 ML: MAPPING LIST
Credit Check
CreditCheckRequestNo.
CustomerNo.(R)
Customer_Name
Request_Date
Credit_Limit_AMT
・
・
・
E
 The position of the denotes

14. Notation
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 Identifier
Among the data items that
are included in an
observation entities , which
corresponds to the identifie
 Reuse(R)
Individual
indicator(Identifier) of other
entities is equivalent to this .
Reuse is inserted by the
occurrence of Relationship.
 Identifier and Reuse
Entity Name
Identifier
Reuse_1(R)
Reuse_2(R)
・
・
・
Reuse_n(R)
Attribute_1
Attribute_2
・
・
・
Attribute_n
EntityType

15. Notation
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 Attrributes
Which corresponds to the
data items that are included
in an observation target
entity
 Date and Timestamp
 Text and description
 Value
 Derivation
 Boolean
 Binary Data
 Others and Copy from
other Entities
Credit Check
CreditCheckRequestNo.
CustomerNo.(R)
Customer_Name
Request_Date
Credit_Limit_AMT
・
・
・
E
 The Attributes

16. A Examples of “QUASI EVENT”
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Pref.ID. Pref_Name CityID. City_Name Ward_ID Ward_Name
Pref City Ward
Pref・City・Ward・QE
PrefID(R)
CityID(R)
WardID(R)
Pref_Name(d)
City_Name(d)
Ward_Name(d)
Pref・City・QE
PrefID(R)
CityID(R)
City・Ward・QE
CityID(R)
WardID(R)
R R R
TS TS
TS

17. A Examples of “QUASI EVENT”_(cont.)
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Pref.ID. Pref_Name CityID. City_Name Ward_ID Ward_Name
Pref City Ward
Pref・City・Ward・QE
PrefID(R)
CityID(R)
WardID(R)
Pref_Name(d)
City_Name(d)
Ward_Name(d)
Pref・City・QE
PrefID(R)
CityID(R)
R R R
TS
TS

18. 商談DTL
A Example of Entities
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商談
商談HDR
商談No.
H_Rev.No.
リードNo.(R)
 商談日
 予算
 案件化予
定日
 要望総額
（D)
 対応時間
商談明細No
D_Rev.No...
商談No.(R)
H_revNo.(R)
品番(R)
 商談詳細
メモ
 要望金額
 要望数量
 希望納期
リード
リードNo.  氏名
 職位
 所属部署
(d)
商談品目
品番  商談許可
期日
 品名
 説明
 提供価格
決定方式
メモ
R
R
E
E

19. The Notation rules for Event -based Entity
1. The Event -based Entity inherit the identifier of the Resource
-based Entity by the Relationship as Reuse.
2. When a relationship is drawn to the event from the event ,
inheritance destination is to inherit the identifier of the
original side
3. However , if the relationship of the original side of the
cardinality constraint of "n", the new correspondence table
“Mapping List” is generated .
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20. The Notation rules for Event -based Entity
1. It’s not an Event -based Entity to Entity
 The Entities other than the Event -based Entity that has the Identifier
is a Resource -based Entities
2. The relationships between Resource -based Entity , the
Quasi-Event occurs.
 It ‘s not affected by the cardinality constraint.
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