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Questions tagged [database-diagrams]

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29 views

Entity Relationship Diagram - Entity depending on attribute

I have an ER-Diagram containing the entity employees. When employees have high skills they may supervise lower skilled employees. How can I model that in an ER-Diagram? My initial approach of was to ...
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1answer
21 views

Need help to design ER diagram

I need to design an ER diagram for a centralized healthcare management system for my college mini-project. Firstly, I came up with the following ER diagram. ER-diagram-1 While designing the tables ...
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0answers
10 views

2 Relationships between same 2 entities

New database student here. I am having troubles understanding this case for ER to relational database conversion. So when mapping this to a database does the table for entity one look like this? ...
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0answers
31 views

Variable layers of data in a multi-country addresses system

My diagram I want to record addresses in my database. The layout I have right now is visible in the diagram below: Considerations Continent, Country, Subdivision and City will be pre-filled, ...
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1answer
34 views

Setting up relationships on a gaming schema with multiple locales

I've devised the following schema: Where BotLocale holds locales like en-US, es-AR, etc. GameArtifact has a primary key which is artifact_id and GameClass with locale, identifier being the primary ...
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0answers
39 views

Room bookings database - does it make sense to create two tables instead of one column?

There are two types of entities: user and room. A user can book room select room unbook room unselect room "Selected room" is a state that indicates when a user has decided to book a room and so he/...
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2answers
53 views

How to Represent Equation with Variables in Relational Database

I am building an application to store the different formulas used for different subjects in school, and I have drawn the following database diagram to depict that scenario: I am having trouble ...
0
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1answer
30 views

Replacing the removed database diagrams feature [closed]

I have a SQL Server database and want to create an ER diagram for it, to analyze tables and relationships. The option to create a diagram is no longer present in SSMS 18. Is there any free tool ...
2
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1answer
195 views

What do the entity-relationship diagram (ERD) symbols used in DBeaver mean?

I don't understand the ERDs used by DBeaver. The diamonds and dots at the ends of the line arent the crow's foot I'm used to. I've googled the subject and checked the docs but can't find a straight-...
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0answers
211 views

Crow's foot notation--what is the difference between “one” and “one-and-only-one” regarding relationship cardinalities?

I'm trying to figure out the difference between the single-bar and double-bar cardinality indicators as in the figure below: Some sources seem to use one notation while others use the other. I can't ...
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2answers
56 views

Error 1005 when Forward Engineering EER diagram

I have created an EER diagram (as shown in the image bellow) in MySQL Workbench and wanted to Forward Engineer to build the DB. After configuring the model options to the Target MySQL Version and ...
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0answers
51 views

Modelling Orders and Messages for an e-Commerce database

In my e-commerce application I would like that buyers and sellers interact via a messaging system to purchase products. The process consists of: The buyer inquiring for a product The seller responds ...
1
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1answer
104 views

How to create a correct entity-relationship diagram (ERD) about a video game profits scenario

I'm starting to build my application database, and I'm really new to the this world, so I have a lot of doubts about my ERD and if its entity types and relationships are ok. This is an application ...
0
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1answer
126 views

Modelling products along with their attributes and discounts for an e-Commerce database

Scenario My application will have products belonging to 1 company. Each of those products will: Have at least 1 quantity Have 0 or more discounts Have 1 or more attributes Belong to 1 category, ...
1
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1answer
98 views

SQL Server Database Diagram

I am using SSMS v18, I need to create an ER diagram from my database. As Microsoft removed diagram from new version of SSMS (v18) so now How can I get a diagram for my database??
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1answer
27 views

Is there a place to store ERDs in Postgres?

Is there a designated spot in Postgres to store Entity-Relationship Diagrams (ERDs)? I could just create a table with a BTYEA column or something, but I want to make sure to use what exists if ...
2
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2answers
85 views

Does the relationship between teams and matches have a many-to-many cardinality ratio?

Diagram I created the following diagram: Considerations So I will create two tables, one called Match and the other one called Teams. In Match there will be data about two teams, Away and Home. ...
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1answer
39 views

How to avoid losing information via UPDATEs due to database design issues

Business requirements I have a database where information about documents and their related packages are kept. Each document can have multiple packages, and each package has its details and product ...
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1answer
1k views

Is it possible to change the color of relationship lines in MySQL Workbench diagrams?

I have MySQL Workbench Community Edition 8.0.15 installed on my Mac OS 10.14.3. I'm currently working on making an ERD with Workbench's EER Diagram. My problem is that whenever I export my diagram, ...
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1answer
54 views

Creating and querying a database to set hierarchical associations between Groups, Users, Items and Points

I am working with three entity types, Group, User and Item. A Group consists of Users, and a User consists of Items. Now, I have to work with a fourth entity type: Point. I want to be able to ...
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0answers
22 views

Relationship constrains in EER

When designing a EER diagram, how do you state or show a specific relationship constraint between entities (or can this even be done). We have a relationship between two entities E and F, but for a ...
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0answers
148 views

Multiple tables for different types of transactions?

Considering a trading system as an example. Would it make sense to have two different tables for credit transactions and asset transactions? creditTrans : table id userId transType status amount ...
0
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1answer
188 views

How to maintain customer addresses for Orders?

The database I am designing is part of a project I am working on. I have come up with 3 simple "business rules": Customers must either be Individuals or Businesses (a business belongs to a certain ...
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0answers
365 views

Gaming shop database schema

I'm trying to design schema for my personal project that would be an online gaming shop. I would like to ask you guys for any suggestions/tips on how could I maybe improve my current draft. Concerns: ...
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0answers
167 views

Modelling a database for a simple IT device tracking scenario

Sorry, my English is not that good. I need a simple IT device tracking sytem at work. For each device I need to know its current location, status and ownership (employee to which it is assigned). ...
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0answers
178 views

Modelling an entity-relationship diagram for a scenario involving companies, services, and clients

I am creating an entity-relationship diagram (ERD) for managing workflow and other details of Company X in which I am maintaining details of the following objects: Employees of Company X Services ...
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0answers
54 views

Creating an entity-relationship diagram about an art fairs and galleries business environment

Scenario description The charactheristics of the business domain under consideration are: Each and every art item has a unique identifying number, and also a name and asking price. Art galleries ...
2
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1answer
688 views

Do you know if this are examples of non-identifying or identifying relationships?

Im using MySQLWorkbench to model a diagram. But Im with some doubts about identifying and non-identifying relationships. It seems that all relationships of the project are identifying. For example, a ...
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2answers
56 views

payment table in relational datase

I have to model a database table for payments. These need to have two fields payment from and payment to and this needs to link to two tables one is clientA and clientB as in the representation below. ...
1
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1answer
25 views

How to express a “some of which are” and “not all are” relationship with enhanced entity-relationship diagrams?

For example: Gardens have attribute gate, Condos have attribute door. Some of the Gardens and Condos are Private_Properties. On the other hand, Private_Properties are not restricted to only Gardens ...
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1answer
1k views

MySQL WorkBench SQL : Cannot Add Foreign Key Constraint (Error 1215) while creating database

Problem: I am receiving the Error 1215: Cannot add foreign key constraint error while running my MySQL schema code generated from the EER Diagram I used to model my database. The Error occurs ...
1
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1answer
790 views

How do I change where database diagram relationship lines attach in MySQL Workbench?

Sometimes, MySQL Workbench makes some strange choices about where table relationship lines get attached. For example, two vertical lines would be better in the following: For a while, these boxes (...
1
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1answer
122 views

Representing a many-to-one relationship in a database diagram

I have two tables loadingDetail, and stowageDetail: loadingDetail | stowageDetail [PK] loadingID (int) | [PK] StowageID (int) [PK] transactionID (in) | [PK] room (int) ...
2
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1answer
206 views

Scripting Creation Of Database Diagrams

Is it possible to script the creation of a database diagram using T-SQL? If not, what is the Database Diagram Designer doing when you use it to save / edit a diagram (is it using PowerShell or some ...
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0answers
225 views

Basic ERD analysis for a martial arts business domain

I am working on a basic website in order to support querying results from martial arts tournament data. We use participation data to determine things like who gets to host tournaments, regional awards,...
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0answers
59 views

Issue with diagrams in sql management studio 2014

I have this issue with sql management studio 2014. When creating a new database diagram and when I add existing table to a new diagram, the data inside a table is obsolete. I tried both dragging a ...
3
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0answers
33 views

How to design a database for my entity-relationship diagram about Projects, Tasks and Developers

I'm new to database and my entity-relationship diagram is as follows: According to that I designed my SQL-DDL database statements as shown below: CREATE TABLE Developer ( DeveloperID int NOT ...
1
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1answer
1k views

Feedback on an entity-relationship diagram for a movie theater business domain

I have an assignment due next week, and for that assignment I am supposed to learn MySQL and create an entity-relationship diagram (ERD). My current attempt Now I've made this ERD The issue I ...
1
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1answer
733 views

Modeling an entity-relationship diagram about Clients, Orders, Payments and Bills

There is a part of an entity-relationship diagram creation that troubles me, I don't know if it's ok. I tried to follow these instructions: A client makes an order (which has products). When the ...
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0answers
583 views

In an ER diagram, do all entities need to be connected?

I am building a model DB of an online store. I have obvious tables such as Customers, Stores, Products, etc... I made an ER diagram, but I realized that my Employees table is sitting out by itself ...
1
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0answers
29 views

PostgreSQL table relationship clarification

I am in the process of setting up table relationships, using a relational diagram provided by our vendor, in PostgreSQL 9.5.3 and am seeking clarification on how to relate a child table that serves ...
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3answers
2k views

How to interpret ternary relationship

I have tried to search online on how to interpret these ternary relationships but haven't found any clear answer. Since I don't understand how to interpret it I am having trouble changing it into ...
1
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1answer
226 views

Modeling a Recursive Association for Linking an Entity Type to Itself

I am designing a simple database as follows: The database should contains an evolving set of standards; each standard has a library of controls; A single control in each standard may map to one or ...
0
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2answers
286 views

Entity-Relationship Conceptual Data Model [closed]

So I am busy learning databases for an rpg I have been thinking of to learn more specialized techniques with game development itself. Now I am trying to draw a conceptual data model to get things ...
0
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1answer
58 views

M:M Relationships

I have question regarding joining tables using composite keys. If I have two tables: "Sales" and "Items" with a M:M relationship between them and my data schema included a joining table called "...
6
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1answer
995 views

Postgres 9.6 export the database structure as pdf [closed]

Is there any tool/software the can export all the tables structure (column names , its datatype ) in the database as a pdf/excel/word. additional diagram export will be added advantage.
2
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1answer
79 views

Understanding Table design in database [closed]

I have 3 years of SQL Server development work experience. Now I am moving to a new company (first jump). I heard in my new company they deal with too many tables. What is the best way to understand ...
2
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0answers
94 views

How can you use an entity-relationship diagram to document business processes?

Past exam question: How can you use an entity relationship diagram to document business processes? As far as I know, I would use an entity-relationship diagram (ERD) to document the relationships ...
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1answer
3k views

How to generate Database Diagram using script?

I need to create a SQL script to generate a Database diagram. It should accept two parameters: DB name Schema It should create a database diagram in Database Diagrams folder with the underlying ...
0
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1answer
102 views

EER Design specification

I just started learning about Databases, and my first assignment has information about an Art Museum that we are supposed to use to define a DB for, demonstrated with an EER Diagram. One ...