ERD (Entity Relationship Diagram)Diagram Hubungan Entitas

1. An entity-relationship diagram (ERD) is a specialized graphic that illustrates the relationships between entities in a database (adalah grafis khusus yang menggambarkan hubungan antara entitas dalam database)(http://databases.about.com/cs/specificproducts/g/er.htm)

2. An entity-relationship diagram is a data modeling technique that creates a graphical representation of the entities, and the relationships between entities, within an information system.(Diagram Hubungan Entitas adalah teknik pemodelan data yang menciptakan representasi grafis dari entitas, dan hubungan antara entitas, dalam suatu sistem informasi)(http://searchcrm.techtarget.com/definition/entity-relationship-diagram)

3. An entity relationship diagram is a graphical documentation of a database's tables, fields, and the relationships between tables in the database. (Sebuah diagram hubungan entitas adalah dokumentasi grafis dari tabel-tabel database, field, dan hubungan antara tabel dalam database)(http://wiki.answers.com/Q/What_is_an_Entity_Relationship_diagram_for_library_management_database)

The entity is a person, object, place or event for which data is collected.The relationship is the interaction between the entities.

Berguna untuk memodelkan data yang akan disimpan/diolah sehingga pihak pengembang dan pengguna bisa sama-sama mengecek kelengkapannya.

Sesudah memodelkan data dalam bentuk ERD, selanjutnya diagram tersebut akan dipetakan untuk menjadi database.

ERD often use symbols to represent three different types of information.

1.Boxes are commonly used to represent entities:

2.Diamonds are normally used to represent relationships and

3.Ovals are used to represent attributes.

SOURCE: http://erw.dsi.unimi.it/diagram.html

Source: http://creately.com/diagram/example/h7iin2581/E-R+Diagram+for+Hotel+management+system

SOURCE: http://creately.com/diagram/example/h7cw0wrb1/+E-R+Diagram+of+Library+Management+System

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