Questions tagged [erd]
Entity Relationship Diagram (ERD) or Entity Relationship Model is a visual representation of the organization of data within databases or information systems
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How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
I want to use Oracle SQL Developer to generate an ER diagram for my DB tables but I am new to Oracle and this tool.
What is the process for creating an ER diagram in SQL Developer?
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How to visualize the relationships between tables of a database schema? [closed]
I would like to generate an entity-relationship diagram (ERD) from an existing PostgreSQL database.
What is the recommended approach to do this?
Are there any built-in tools to do it? Or third-party ...
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Django - Model graphic representation (ERD) [closed]
I'm searching a way to represent my Django project model graphically.
Is there a "native" way to do this kind of ERD (diagram) ?
Update following @Etienne instructions
Here is an example of ...
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Generate ER Diagram from existing MySQL database, created for CakePHP [closed]
For CakePHP application, I created MySQL database.
Which tool to be used to create ER Diagram of database? Fields and relations between tables are created in a way cakePHP likes.
thank you in ...
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Is ERD considered a kind of UML diagram?
Are Entity Relationship Diagrams(ERD's) considered a type of UML diagram or are they a separate thing?
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Equivalent of ERD for MongoDB?
What would be the equivalent of ERD for a NoSQL database such as MongoDB?
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What mysql database tables and relationships would support a Q&A survey with conditional questions? [closed]
I'm working on a fairly simple survey system right now. The database schema is going to be simple: a Survey table, in a one-to-many relation with Question table, which is in a one-to-many relation ...
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High-quality ERD generator for PostgresQL under Linux? [closed]
Background
MySQL Workbench can produce appealing and high-quality ERDs such as:
Research
What PostgreSQL ERD tools are available that meet the requirements? The following are unsuitable:
...
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answers
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Pgadmin III Alternative - Windows [closed]
I am looking for an alternative to the free pgAdmin III that works on windows. I basically need it for managing my tables / views / SP / etc. If it did ER diagrams, that is a huge plus, and I like ...
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Anyone have an ERD symbols quick reference? [closed]
I'm looking for a one-page quick-reference or cheatsheet (preferably in PDF) to the meanings of the various ERD symbols in Crowsfoot/Martin notation.
I've done a lot of googling, but have not found a ...
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How to identify a strong vs weak relationship on ERD?
A dashed line means that the relationship is strong, whereas a solid line means that the relationship is weak. On the following diagram how do we decide that the relationship between the Room and ...
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Difference between ER diagram and Class diagram
I have been given a description and need to draw ER diagram and Class diagram for the description.
Now I am having issue with understanding the differences between these 2 diagrams.
When I draw the ...
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What GOOD tools are available for generating ERD from a SQL Server Database? [closed]
I am trying to generate an Entity Relationship Diagram from an existing MS SQLServer 2005 database. What tools are available? Specifically,I am not only interested in ERD's more directly I am looking ...
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What's a Good Database ERD Tool for Linux? [closed]
I've recently switched to Linux on my work machine and, new to the Linux desktop environment, I'd like to find a decent ERD tool for database design. Booting back into my Windows partition every time ...
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Difference between ER diagram and EER diagram
What is the difference between ERD (Entity relationship diagram) and EERD (enhanced entity relationship diagram)?
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How to create a PDF database diagram in SQL Server?
I have a relatively small database that I would like to generate a diagram for and then create a pdf of that diagram. I have the diagram created in SQL Server (all tables would fit on one page of a ...
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Database design for a recursive relationship
Consider this case where I'm trying to model a database for a company:
Entities: Employees, Managers, Departments.
An Employee works in only 1 Department while a Department may have many Employees ...
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Create ERD type diagrams from Rails code
I'm beginning to learn Ruby on Rails, and looking at other peoples code. Is there any way to take an exisiting codebase and create object relationship diagrams or Entity relationship diagrams (ERD's) ...
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Neo4j - is it possible to visualise a simple overview of my database?
I've got my graph database, populated with nodes, relationships, properties etc. I'd like to see an overview of how the whole database is connected, each relationship to each node, properties of a ...
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How to create an ERD using phpmyadmin
is it possible to create an ERD using phpmyadmin?
I see people posting the following link : http://goo.gl/0z3vFE
But this does not work for me, for some reason I don't have that option in the 'MORE' ...
user3481441
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answers
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Tools to generate a database diagram/ER diagram from existing Oracle database? [closed]
Looking for tools (windows platform) to genereate ER diagram (or similar) from an existing Oracle database.
Any good tools out there that are free to use or low cost?
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How are super- and subtype relationships in ER diagrams represented as tables?
I am learning how to interpret Entity Relationship Diagrams into SQL DDL statements and I am confused by differences in notation. Consider a disjoint relationship as in the following diagram:
Would ...
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Generating ERD diagrams within Visual Studio
In order to create an ERD diagram for new projects I have been using Visual Studio's entity framework designer. Essentially I'm creating a "dummy project", adding entity framework via Nuget and ...
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Differences between a conceptual UML class diagram and an ERD?
If I create a conceptual class diagram such that each class captures 'name' and 'attributes' but not 'operations', have I not basically created what would be otherwise considered an ERD? I'm trying ...
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Is it possible to style an Entity Relation Diagram with Mermaid.js like Flowcharts to indicate a difference in entities?
I can't seem to style any elements within my ERD.
Having an entity called PERSON, any of the following code results in a syntax error:
style PERSON fill:#f9f;
or
classDef className fill:#f9f;
class ...
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Tool to generate a ERD (entity-relation diagram) based on JPA annotations
I'm writing a java code using ormlite. I was wondering if it's possible to generate an ERD from the JPA annotations in my code. Basically, I need the reverse of this: How can I transform Entity-Based ...
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SQL - Query - max(count())
I'm studying for my Database Systems Exam (tomorrow) and I'm having trouble in exercises where I'm asked to write queries. Here's an example:
I am being asked to write a query to answer the following ...
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How to import your existing table structure in EER diagram using MySQL Workbench?
I just want to ask about my problem. Right now I have an existing database and tables. And I want to get the structures of every table. I just need to get their column name for comparison for other ...
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Which should be created first ER Diagram OR Class Diagram?
The very first step i created a DFD. Then i moved on to create a Class Diagram. And while doing that i felt that i should create the ER diagram first. As there were many details which could not be ...
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Single line with an arrow mark in Entity Relattionship diagram
What do single line with an arrow mark in ER diagram represent?
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Inheritance relationship in ERD diagrams
I have question about inheritance representation in ERD-diagram.
The following example:
I have plane, and I have also two types of planes
1-PersonsPlane
2-CargoPlane
I am confused about which ...
user3151426
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answer
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What do the mysql workbench column icons mean in ER Diagram?
Can any one help me in explaining about the icons in the ER Diagram of Database created in MySQL Workbench.
Blue Diamond (Filled);
Blue Diamond (unfilled);
Red Diamond, et cetera;
Thanks!
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When to use UML Association Classes?
Can I improve my design on these 2 diagrams below? If so, how?
I am confused by the use of association classes in my diagrams. Should I use them?
Figure 1
Figure 2
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How to decide whether to use ER or UML for modelling?
A UML diagram can be used both to model database designs and class designs, but an ER diagram should be used exclusively in database problems. How do you pick one graphical representation over the ...
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How represent multiple similar foreign keys in ERD database diagram?
I'm making an ERD of my database, and am stuck with a little dilemma.
Consider the tables foo and bar. foo has three columns that are foreign keys, referencing to bar's primary key. My question is: ...
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ER Diagram - Showing Deliveries to Office and to its Branches
For a small project, I am creating an entity relationship diagram for a simple stock-tracking app.
User Story
Products are sold by product suppliers. Products are ordered by an office and ...
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Saving diagram failed! Verify that Graphviz is installed and in your path, or use filetype=dot
When I run rake db:migrate I get this error
rake aborted!
Saving diagram failed!
Verify that Graphviz is installed and in your path, or use filetype=dot.
Full log:
rake db:migrate
Loading ...
user1670773
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One to many relationship on the same table
Here is the situation:-
I have a table called Users. This contains user data for students and tutors as most of the data required is the same.
Having completed the system I am now told that the ...
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MySQL Workbench - Rearranging Schema Diagram - Autolayout not working
I am using MySQl Work-bench 2 to construct a schema diagram., by reverse engineering the database. However, when I included 450 tables., the tables are getting overlapped with one another and its ...
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Use Draw.io to generate SQL / DDL scripts?
There are a lot of resources on internet about how to import tables into ER diagram on Draw.io using sql script.
For example here (but I find plenty of resources googling):
https://www.drawio.com/doc/...
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How to Draw UML Diagram for NoSql Like MongoDB? [duplicate]
I would like to know that can i draw UML diagrams for my web application which has back end Mongodb?
Or is there any other diagrams for NoSql?
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How to adjust the relationship line between tables when the position of tables are changed in pgAdmin4?
I created two tables and built a foreign key between them, now I want to reorganize position of the tables in ERD (pgAdmin4 - version 6.14).
I'm try reorganize, but I cannot, see image-01:
My ...
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Modeling 3 entities with relationships
Say we have three entities in our environment, Teacher, Student and Course.
Every teacher has (teaches) 1 or more Courses and each Course is offered by 0 or more teachers
Every Student has taken 1 or ...
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PGAdmin create ERD from explicitly selected tables?
I have the ability to generate an ERD from an entire DB. My DB is huge and I want to focus on a subset of table relationships. Is this supported in PGAdmin?
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TypeORM: how to implement bidirectional relationship, multiple fields --> one entity type
I've created a 'document' entity:
e.g.
@Entity()
export class Document {
@PrimaryGeneratedColumn()
id: number;
@Column()
name: string;
@Column()
path: string;
...
}
Multiple ...
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Open source ER diagramming tool for mysql [closed]
I want to reverse engineer (import into diagram form) the database definition dump of a database I have, then since no foreign keys are defined in this particular database, I want to be able to ...
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How to present a database design?
I am doing a project in the university and it includes a MySQL database. I have a design for the database in terms of a list of tables and their respective fields.
In what form should I present this ...
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Avoid Circular Dependency
I am developing a travel management application. The design in question is something like following :
Each person in a tour is designated as a Traveler.
Each Traveler has a Passport.
Now, a Traveler ...
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Database design normalization help needed (5nf)
Can you guys show me how to get this ERD in 5th normal form? We did a class assignment yesterday where we had a real client come in and explain to us his need my group came up with this model I am ...
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what is the differences between that line in oracle ERD?
What is the differences between that relationship lines in oracle ERD?
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