ERD Symbols and Meanings
Modeling your data using entity-relationship diagram (ERD) with Crow's Foot notation which is popular in Structured Systems Analysis, Barker's Notations, Design Methods and information engineering you need the software that is easy in use having all necessary elements for creating the needed flowcharts as well as their examples. You can find all essential ERD symbols and its meanings on our site with tutorials of how to use it and you can always use the already existing layouts for making your own diagrams in our Solution Park. Once you download our application with extension of hundreds of design elements you’ll find it simple to start using it straight away and you’ll be pleasantly surprised of how smart this tool for making the charts is.
Design elements Crow’s Foot notation
Crow's Foot notation is used in Barker's Notation, Structured Systems Analysis and Design Method (SSADM), and information engineering. Crow's Foot diagrams represent entities as boxes, and relationships as lines between the boxes. Different shapes at the ends of these lines represent the cardinality of the relationship.
Entity-Relationship model making possibility to describe a database in which in the tables data can be the point to data in other tables — for instance, your entry in the database could point to several entries.
To create an ERD, software engineers mainly turn to dedicated drawing software, which contain the full notation resources for their specific database design — ERD symbols and meanings. CS Odessa has released an all-inclusive Entity-Relationship Diagram (ERD) solution for their powerful drawing program, ConceptDraw DIAGRAM
Example 1. Entity Relationship Diagram symbols and meaning
When you need to describe efficiently a database using the Crow’s Foot notation icons, ConceptDraw DIAGRAM gives you the ability to draw Entity Relationship diagram (ERD) fast and easy.
Design elements Chen's notation
The Chen's ERD notation is still used and is considered to present a more detailed way of representing entities and relationships.
Use also ConceptDraw DIAGRAM enhanced with powerful Entity-Relationship Diagram (ERD) solution to draw your own ER diagrams using Chen's notation icons.
| Symbol | Shape Name | Symbol Description |
| Entities | ||
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Entity | An entity is represented by a rectangle which contains the entity’s name. |
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Weak Entity | An entity that cannot be uniquely identified by its attributes alone. The existence of a weak entity is dependent upon another entity called the owner entity. The weak entity’s identifier is a combination of the identifier of the owner entity and the partial key of the weak entity. |
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Associative Entity | An entity used in a many-to-many relationship (represents an extra table). All relationships for the associative entity should be many |
| Attributes | ||
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Attribute | In the Chen notation, each attribute is represented by an oval containing atributte’s name |
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Key attribute | An attribute that uniquely identifies a particular entity. The name of a key attribute is underscored. |
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Multivalued attribute | An attribute that can have many values (there are many distinct values entered for it in the same column of the table). Multivalued attribute is depicted by a dual oval. |
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Derived attribute | An attribute whose value is calculated (derived) from other attributes. The derived attribute may or may not be physically stored in the database. In the Chen notation, this attribute is represented by dashed oval. |
| Relationships | ||
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Strong relationship | A relationship where entity is existence-independent of other entities, and PK of Child doesn’t contain PK component of Parent Entity. A strong relationship is represented by a single rhombus |
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Weak (identifying) relationship | A relationship where Child entity is existence-dependent on parent, and PK of Child Entity contains PK component of Parent Entity. This relationship is represented by a double rhombus. |
In addition to the vector stencil image libraries with full standardized Chen and Crow’s foot notations included, the Entity-Relationship Diagram (ERD) solution contains a number of ERD templates and samples added to the solution pack. They will help users quick start representing their own ideas.
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Example 2. Entity Relationship Diagram samples and templates in ConceptDraw STORE
Try it today for saving your time sake not to look for something else once you have great chance to use this excellent product already now!
The following features make ConceptDraw DIAGRAM the best Entity Relationship Diagram ERD Software:
- You don't need to be an artist to draw professional looking diagrams in a few minutes.
- Large quantity of ready-to-use vector objects (entity relationship diagram symbols and meaning) makes your drawing diagrams quick and easy.
- Great number of predesigned templates and samples give you the good start for your own diagrams.
- ConceptDraw DIAGRAM provides you the possibility to use the grid, rules and guides. You can easily rotate, group, align, arrange the objects, use different fonts and colors to make your diagram exceptionally looking.
- All ConceptDraw DIAGRAM documents are vector graphic files and are available for reviewing, modifying, and converting to a variety of formats: image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash, MS Visio.
- Using ConceptDraw STORE you can navigate through ConceptDraw Solution Park, managing downloads and updates. You can access libraries, templates and samples directly from the ConceptDraw STORE.
- If you have any questions, our free of charge support is always ready to come to your aid.
TEN RELATED HOW TO's:
When we start to speak about databases, we must always mention database structure visualization. One of the most common ways to do it is to create an entity relationship diagram, and to put appropriate symbols on it. It is important either for database projecting and for its' future maintenance.
Entity Relationship Diagram describes data elements and their relationships within a database. There are a set of special symbols that depict each element of an entity relationship diagram. Entities - represents some stable components such as supplier, employee, invoice, client, etc. Relation symbols show how the entities interact. Attributes define characteristics of the relationships. Attributes can be one-to-one or many-to-many. Physical symbols is used in the physical models. They represent items such as fields, tables, types and keys. ERD physical symbols are the building material for the database. Notation lines are used to illustrate the relationships. The most common method is Crow’s Feet notation. You can use ConceptDraw Entity-Relationship Diagram (ERD) solution to represent a database using the Entity-Relationship model.
Picture: Entity Relationship Diagram Symbols
Related Solution:
It is easy to recreate any informational system structure using diagrams. There are three main components of any ER diagram: entity, attribute and relationship. Basing on these three components, one can define other, less used elements, such as weak entity or relationship, derived attribute, recursive relationship etc.
This is the set of graphic elements of ERD Chen's notation. This ERD notation is used to represent an entity–relationship models. It involves the set of geometric forms: rectangles - depicting entities, ovals - representing attributes and diamonds depicting relationships assigned for first-class objects, that can have relationships and attributes of their own. Connections are displayed with arrowed lines. It is known that the Chen's ERD notation is used to show a detailed view of entities and relationships. ConceptDraw Entity-Relationship Diagram solution from the Software Development section of Solution Park provides the ability to create ERD of database structure for software development purposes using the Chen’s notation elements.
Picture: Components of ER Diagram
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The vector stencils library from the solution Information Model Diagrams contains specific data type symbols of the EXPRESS-G notation such as entity data type symbols, simple data type symbols, enumeration data type symbols, defined data type symbols, select data type symbols and specific attribute symbols for ConceptDraw DIAGRAM diagramming and vector drawing software. The Information Model Diagrams solution is contained in the Software Development area of ConceptDraw Solution Park.
Picture: Express-G Diagram
While creating flowcharts and process flow diagrams, you should use special objects to define different statements, so anyone aware of flowcharts can get your scheme right. There is a short and an extended list of basic flowchart symbols and their meaning. Basic flowchart symbols include terminator objects, rectangles for describing steps of a process, diamonds representing appearing conditions and questions and parallelograms to show incoming data.
This diagram gives a general review of the standard symbols that are used when creating flowcharts and process flow diagrams. The practice of using a set of standard flowchart symbols was admitted in order to make flowcharts and other process flow diagrams created by any person properly understandable by other people. The flowchart symbols depict different kinds of actions and phases in a process. The sequence of the actions, and the relationships between them are shown by special lines and arrows. There are a large number of flowchart symbols. Which of them can be used in the particular diagram depends on its type. For instance, some symbols used in data flow diagrams usually are not used in the process flowcharts. Business process system use exactly these flowchart symbols.
Picture: Flowchart Symbols: Meaning and Examples
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Database structures are usually described by ER-diagrams which represents entities as boxes with lines-connections between them. You can create any entity-relationship diagram (ERD) by means of ConceptDraw DIAGRAM using ready-to-use templates and special libraries containing all the needed symbols and shapes. Creating a model for your database from now on can take just a few minutes.
ERD (entity relationship diagram) designed to show the logical structure of databases. It intended to depict the relationships between data components (entities). ERDs are a popular tool for software engineers and architects. Using ERD they can manage the every aspect of database design. Also ERD can be used as guidelines for testing and communications before software release. This diagram represents the file reference system of the WordPress web platform. Because entity relationship diagrams have such a broad application area through the prevalence of database technology, it can be applied for a wide range of users.
Picture: Entity-Relationship Diagram (ERD) with ConceptDraw DIAGRAM
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An abstract representation is usually the first thing you will need while developing a database. To understand the ways that databases are structured, you should look through entity-relationship diagram examples and see the notations features and attributes. With an entity-relationship model you can describe a database of any complexity.
This Entity-relationship diagram is a tool for software developers. It enables every element of database to be managed, communicated and tested before release. This ERD was created using symbols advocated by Chen's notation. Because of a linguistic origin of the Chen’s notation, the boxes representing entities could be interpreted as nouns, and the relationships between them are in verb form, shown on a diagram as a diamond.
Picture: Entity Relationship Diagram Examples
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There are many ways to describe a database structure. One of the most usual is to draw an entity relationship diagram (ERD) using a Crow’s Foot notation to represent database elements. If you don’t want to draw it on paper, you should use an appropriate software.
An entity-relationship (ER) diagram is used to show the structure of a business database. ERD represents data as objects (entities) that are connected with standard relationships symbols which Illustrate an association between entities. ERD, there is a wide range of ERD notations used by data bases architects for reflecting the relationships between the data entities. According to the crow’s foot notation relationships are drawn as single labeled lines designating a certain kinds of relationship. Crow foot notation is a most frequently used ERD standard, because of improved readability of diagrams, with a more accurate use of space on the page._Win_Mac.png)
Picture: Entity Relationship Diagram - ERD - Software for Design Crows Foot ER Diagrams
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Using diagrams, you can visualize the flow of the information or build a detailed data structure. There's no need to have a degree in software and database design with ConceptDraw DIAGRAM , because this software has all the tools needed in developing models and diagrams. Project planning, designing and prototyping was never so easy.
This UML diagrams can be used to visualize a model of the data base development process. A UML diagram shows a graphical view of a structure of software system: components and relationships.
Using Unified Modeling Language helps to depict logical and physical elements of a data base, visually represent requirements and sub-systems. UML diagrams allows developers to organize and predict critical issues, as well as collaborate data base information.
Picture: Software and Database Design with ConceptDraw DIAGRAM
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In software engineering, a UML Class Diagrams is a type of static structure diagram that is used both for general conceptual modeling of the systematics of the application, and for detailed modeling translating the models into programming code.
Use ConceptDraw DIAGRAM with UML class diagram templates, samples and stencil library from Rapid UML solution to show the classes of system, their attributes, operations or methods, and the relationships among the classes.
Picture: UML Class Diagrams. ConceptDraw DIAGRAM - Diagramming Software for Design UML Diagrams
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ConceptDraw DIAGRAM extended with Data Flow Diagrams solution is the best diagramming and vector drawing software for quick and easy designing the Data Flow Diagram Example of any complexity.
Picture: Data Flow Diagram Example
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