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How do you start a diagram
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by using boxes to represent entities
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do you follow the flow of the primary and foreign keys?
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they don't actually "flow"
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How do you represent the relationships?
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usually with lines connecting related boxes
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I read that they should be expressed as verbs
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yes, that's a good idea, and remember to have two verbs, one for each direction
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why can't the primary keys be used in the diagram?
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but they can