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6 days ago
How is maximum cardinality expressed in IE Crow's Foot E-R diagrams?
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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The Crow's Foot E-R diagram notation uses a hash mark to indicate a maximum cardinality of one and a crow's foot to indicate a maximum cardinality of many. Each symbol is placed immediately next to the rectangle symbolizing an entity. These symbols are combined in various forms to signify 1:1, 1:N and N:M relationships.
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