mysql - Which one is ER diagram - Stack Overflow
2016年5月11日 · Your first diagram is a proper ER diagram, using the concepts and notation developed by Peter Chen in his paper The Entity-Relationship Model - Toward a Unified View …
How to generate an entity-relationship (ER) diagram using Oracle …
2011年7月5日 · I just created a relational model diagram via the menu: File->Data Modeler->Import->Data Dictionary.... I also have the stand-alone Data Modeler, which does the same …
Generate an E-R Diagram by reverse-engineering a database
2014年5月7日 · By the way, I strongly suggest using "circo" or "twopi" to plot the diagram as opposed to plain "dot" or even "neato" - at least in my experience produces much pleasant …
Translating relationship attributes from ER diagram into SQL
2015年2月10日 · So far I've got an ER diagram drawn up which I think is correct: I can get the basics (e.g. creating a Student table etc) but I'm having trouble getting my head around how to …
How to identify a strong vs weak relationship on ERD?
2013年5月21日 · In an ER diagram, I believe when the relationship is strong, i.e., the primary_key of the parent forms a composite or non-composite primary_key in the child entities, we use a …
What is different between ER Diagram and Database Schema?
A database schema is usually a relational model/diagram. it shows the link between tables: primary keys and foreign keys. it shows the link between tables: primary keys and foreign …
Generating ERD diagrams within Visual Studio - Stack Overflow
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 …
database - Understanding ER diagrams - Stack Overflow
2016年1月26日 · From what i have learned, the last diagram says "for every couple of school and teacher, there is one and only course" . So, if i have 3 schools, 3 teachers and 3 courses, …
Relational Schema to ER Diagram /Cardinalities difference
2018年11月9日 · The ER diagram says that the corresponding binary relation is 1:N in Dnum:Pnum & N:1 in Pnum:Dnum. Because CONTROLS has that particular 1 in its …
Is there a way to represent relationship between a tuple and to a …
2015年11月6日 · There isn't a standard ER way to indicate a table per entity instance, ie an association set per entity instance. That's because you would normally have one liked page …