The use of high-level conceptual data models to support database design. ... Ternary Relationship called SetsUp. 24. Quaternary Relationship called Arranges. 25 ...
Most useful additional data modeling concepts of ... If A B and B C, then A C ... A, B and C are attributes of a relation such that if A B and B C, ...
Label the edges between the relationships and the entity set with names called roles. ... E.g., can not require all dog owners to give unique names for their pets ...
... edges between the relationships and the entity set with names called roles. ... E.g., can not require all dog owners to give unique names for their pets. 6/8/09 ...
Sue's Bar Ann Pete's Ale. Joe's Bar Bob Bud. Joe's Bar Bob Miller. Joe's Bar Cal Miller ... Not every beer is an ale, but some are. ... Pete's Ale. 34. STEM. PNU. Keys ...
Darren A. Blair. Kim Frank. Phillip Limitone. Susan Varghese. Leigh Weston ... An Entity is a person, place, event or concept, which represents the structure ...
View the league standings (brings up the League Standings form) Add, modify, delete teams ... View the league standings by team. League Standings Form. 4/29/09 ...
... set of all persons, companies, trees, holidays. Entity Sets customer and loan ... E.g. Suppose employees of a bank may have jobs (responsibilities) at multiple ...
For a car: VIN and license plate number. 8. Value sets (domains) of attributes. Set of values that may be assigned to an attribute of an individual entity ...
Basic Instinct | Sharon Stone. Total Recall | Arnold Schwarzeneger. Total Recall | Sharon Stone. This table is called the relationship set for the relationship. ...
gerund. RELATIONSHIP DEGREE. Unary 1. Binary 2. Ternary 3. RELATIONSHIP CARDINALITY ... A company has a number of employees. The attribute of EMPLOYEE include ...
Aggregation ... Aggregation cont. Suppose that employees are assigned to monitor a ... Aggregation allows us to indicate that a relationship set participates in ...
Two main types of connection traps are called fan traps and chasm traps. 37. Chapter 3 ... Chasm Trap ... ER Model with Chasm Trap Removed. 43. Chapter ...
Generalization: Bottom up process that is the reverse of the specialization process. ... Phone. Contact_Name. Contact_Phone. Date. Job_Offer. Position ...
NOMO Auto. Entity-Relationship Diagrams. IST 210, Section 4. Spring 2005. Team A. Team B ... Dealer. Works At. O_Man. Location. G_Man. Phone. State. Street. Car ...
Limitations of basic concepts of the ER model and requirements to represent more ... generalization, aggregation, and composition in an EER diagram using UML. ...
Convert the E/R model to a number of relations in a relational schema. ... Befriend. Women. Men. Marry. Women. Men. 21. Representing 'Multiplicity' ...
Every did value in Departments table must appear in a row of the ... Some constraints (notably, functional dependencies) cannot be expressed in the ER model. ...
You've just been hired by Bank of America as their DBA for their online banking web site. ... Both, but more of a noun to a bank. ( hence (a) probably more ...
(d/o) (disjoint/overlapping. next ) Completeness Constraint. Specific ... If not disjointed, overlap; that is the same entity may be a member of more than ...
... in logical data base design. Entity Relationship Model ... An object that exists and distinguishable from other objects. Concrete Entity Vs. Abstract Entity ...
... constraints by drawing either a directed line ( ), signifying 'one,' or an undirected line ( ), signifying 'many,' between the relationship set and the entity set. ...
... of the same fact may become inconsistent if we change one and ... Beginning database designers often doubt that anything could be a key by itself. ...
... subclasses of the specialization must be disjointed (an entity can be a member ... If not disjointed, overlap; that is the same entity may be a member of more than ...
Value Sets (Domains) of Attributes ... A relationship type R among n entity types E1, E2, ..., En defines a set of ... a relationship with different roles (e.g. ...
... set of all persons, companies, loans, holidays. 6.5. Entity Sets customer and loan ... Example: Suppose employees of a bank may have jobs (responsibilities) at ...
create a relation R that includes all the simple attributes of E; ... max overdraft. A supertype and subtypes. U. U. ACCOUNT. Account# Balance. SAVINGS_ACCOUNT ...
( a) Two entity types CAR and TRUCK. (b) Generalizing CAR and TRUCK into VEHICLE. v1 v1 ... it is mandatorily inserted in at lease one of subclasses. 4-20 ...
Exercise. What can you say about policy of the bank from the ER diagram? ... Design Exercise. Design a DB using ER, and sketch the resulting diagram. ...
E.g a ternary relationship R between A, B and C with arrows to B and C ... The use of a ternary relationship versus a pair, or triple, of binary relationships. ...
Aggregation vs. ternary relationship: Monitors is a ... relationships: Binary or ternary? Aggregation? Constraints in the ... Ternary Relationships ...
1 Using High-Level Conceptual Data Models for Database Design ... Relationship types of degree 3 are called ternary and of degree n are called n-ary ...
Attribute classes. Course entities: CS107, Stats10, ... Student ... Attributes. PER ... to Y.B in a PER model is any first-order expression involving ...
Data-oriented approach - because data are more stable than the functions (or ... basis for ANSI IRDS (Dolk & Kirsch, 1987; Winkler 1989) 5. Example COMPANY Database ...
Conceptual design: (ER Model is used at this stage.) What are the entities and ... Entity Set: A collection of similar entities. E.g., all employees. ...
... subparts represent more basic attributes with independent meanings of their own. ... In the previous example, the first name is enough to identify kids within a ...
A data model is a collection of concepts that can be used to describe the ' ... An entity type describe the schema (intension) for a set of entities that ...
In a given set of requirements for a database, we can generally assume the ... Binary, ternary, n-ary. Can have attributes. Grades. HoursPerWeek of WORKS_ON. Intention ...
Explain the Entity Relationship (ER) model and its constructs ... Tom Waits. CFO. Peter Garrett. CIO. Shawn Colvin. IS Manager. Operations. Van Morrison ...
Suppose that drinkers will only drink certain beers at certain bars. ... Bar Drinker Beer. Joe's Bar Ann Miller. Sue's Bar Ann Bud. Sue's Bar Ann Pete's Ale ...
Semi-automatic Entity-Relationship Modelling Through Natural Language Processing ... HE3- A gerund (noun converted from a verb or known as verbal noun) may indicate ...
... EMPLOYEE's TC id no, address, salary, sex, and birthdate. ... Address (Apt#, House#, Street, City, State, ZipCode, Country) or ... and Relationship Types (2) ...