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Ceng 351 / Database »

[25 Dec 2010 | No comments | 2,019 views ]
Database Courses ? 2 (Entity ? Relationship Model )

Entity ? Relationship model is a Database design tool for creating a diagram.
( ?entity? means record, object )


? Binary Relationship Set
? Ternary Relationship Set


There are kinds of attributes. Some of them is like that:


? Single valued attribute: at most one value
?Multi-valued attribute: 0 or more similar values. We don?t put them to the E-R diagram, but we can…

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