Can u please tell me the limitations of ER diagram with examples

3 ANSWERS

1. Guest11600550
   

   it doesnt represent relationship among relationships...

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2. Guest11094065
   

   i want some basic examples of ERD ......with digram this can help me for understanding the ERD.......

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3. Leonardo
   

   Definition: An entity-relationship (ER) diagram is a specialized graphic that illustrates the interrelationships between entities in a database. ER diagrams often use symbols to represent three different types of information. Boxes are commonly used to represent entities. Diamonds are normally used to represent relationships and ovals are used to represent attributes. Also Known As: ER Diagram, E-R Diagram, entity-relationship model Examples: Consider the example of a database that contains information on the residents of a city. The ER digram shown in the image above contains two entities -- people and cities. There is a single "Lives In" relationship. In our example, due to space constraints, there is only one attribute associated with each entity. People have names and cities have populations. In a real-world example, each one of these would likely have many different attributes. Hope that helps,

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