Entity relationship model
For each of the projects, do the following:
a. Draw an ER diagram. Make sure each entity type has at least one key attribute. Document any assumptions you make. Avoid diagrams with a single entity.
b. For each attribute, determine its domain of values, whether null is an acceptable value, and, if acceptable, what null indicates.
c. If you think the description is incomplete, list other data the database should store.
d. Adjust your design to incorporate these additions.
1. A chemistry department wants to have a database of all chemicals in the stockroom. The information includes the name, molecular formula, amount on hand, date purchased, supplier, and supplier contact information.
2. A space agency wants to develop a database of all satellites that humans have launched into space. Data includes the satellite identification, date of launch, destruction date, purpose, maximum orbital altitude, launching location, launching agency, and contact information for agency.
3. An environmental agency wants to catalogue all the plants in an area that is susceptible to acid rain. Data should include genus, species, quantity, date, quadrant identification number, quadrant location, average altitude of quadrant, and botanist.
4. A psychological study requires participants to answer a number of questions related to personality. The database should store the multiple choice answers (A, B, C, D) to the questions and information about each participant, such as participant id, age, and sex. The database should compute a score based on the individual's answers. The score indicates one of 8 personality categories. Each category has an identifying name and specifies that each of three qualities is either true or false.
View Answers
Related Tutorials/Questions & Answers:
Entity RelationshipEntity Relationship Draw
entity relationship diagram for the following scenario.
A university has many departments whereas each department belongs to that particular uni.That uni has also many buildings whereas each building
Advertisements
Entity Relationship DiagramEntity Relationship Diagram Draw only
entity relationship diagrams for the following scenario. Include any attributes you think should be represented.
. Each engineer works on a number of projects. For every engineer a record
Entity Relationship Diagram 3Entity Relationship Diagram 3 Task 3
Activities:
Identify all entities and attributes from the given scenario.
Draw
entity relationship diagram of the given from scenario.
Determine primary key and foreign keys from given
RelationShipRelationShip i have 2 table with one to many
relationship how to add in these tables with hibernate please provide me, sample example.
example:-
one person have many address, when adding person will simply add, and for address
JPA One-to-One Relationship JPA One-to-One
Relationship
... will learn about the one-to-one
relationship. In the one-to-one relation mapping a single value association
to another
entity.
One-to-One: In one-to-one
Maven, Gradle, SBT, Ivy, Grape, Leiningen and Buildr Dependency for entity-model version 1.0.0:
entity-
model:1.0.0 Java library in your project..
Maven, Gradle, SBT, Ivy, Grape, Leiningen and Buildr
Dependency for
entity-
model version 1.0.0..., Leiningen and Buildr Dependency for
entity-
model version
1.0.0. You
JPA Relationship
JPA
Relationship
...
relationship. JPA supports the
relationship between entities.
There are following types of
relationship:ADS_TO_REPLACE_1
One-to-one
One-to-many
Many-to-one
Many
Resultset with one to many relationship Resultset with one to many
relationship Suppose there are 5 tables in database named A,B,C,D and E. A has one to many
relationship with B,C,D and D has one to many
relationship with E. Beam class of A contains array of Class B
entity beanentity bean can any one tell me how to develop and execute ---------- j2ee
entity beans (cmp,bmp) example in weblogic server with (netbeans.../ejb/
entity-bean-example.shtml
JPA One-to-Many Relationship JPA One-to-Many
Relationship
... the one-to-many
relationship and how to develop a one-to-many relation in your JPA
Application.
One-to-Many: In this
relationship each record in
Table-A may have
JPA Many-to-Many Relationship JPA Many-to-Many
Relationship
... the many-to-many
relationship and how to develop a many-to-many relation in your JPA
Application.
Many-to-many: In this
relationship each record
in Table-A may
JPA Many-to-one Relationship JPA Many-to-one
Relationship
... about the many-to-one
relationship and how to develop a many-to-one relation in your JPA Application.
Many-to-One: In this
relationship many related
records
What is Digital Relationship? and expanse of the term digital
relationship. But as we are immersed already... of digital
relationship. Digital means concerning digits or numbers and it refers... with. A
relationship across the digital framework of communication without being known to each
Building a Parent Child relationship XML Building a Parent Child
relationship XML PARENT CHILD
10788009 10788003
10788003 10788004
10788004 10788010
10788004 10788011
10788003 10788005
10788005 10788012
10788012 10788013
10788013
An Entity Bean Example.
The EJB 3.0
entity beans are used to
model and access relational...;
Entity:
An
entity can be considered as a lightweight
persistence domain object. An
entity defines a table in a relational database
and each
ModuleNotFoundError: No module named 'entity'ModuleNotFoundError: No module named '
entity' Hi,
My Python... '
entity'
How to remove the ModuleNotFoundError: No module named '
entity'... to install padas library.
You can install
entity python with following command
ModuleNotFoundError: No module named 'entity'ModuleNotFoundError: No module named '
entity' Hi,
My Python... '
entity'
How to remove the ModuleNotFoundError: No module named '
entity'... to install padas library.
You can install
entity python with following command
What is Digital Relationship Marketing?Digital
relationship marketing is increasingly becoming the focus of marketing...
relationship holds some key clues to how we can response to marketing initiatives and campaigns in the new era and thus digital
relationship marketing became
Working with Entity bean using JPAWorking with
Entity bean using JPA
Working
with
Entity bean using JPA
An
entity defines a table (consisting of rows and columns) in a relational
what is an entity in hibernate?what is an
entity in hibernate? what is an
entity in hibernate?
Entity: In general
entity is an object that has some distinct value. In a persistent storage mechanism, an
entity is a business object. Each
entity has
Design and develop entity EJBs
Design and develop
entity EJBs... components Next
Design and develop
entity EJBs
Creating
entity beans with container-managed persistence (CMP