In Chen’s notation partial keys (discriminator) were shown as dashed lines, how are they shown in UML ER (entity-relationship) diagram?
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In Chen’s notation partial keys (discriminator) were shown as dashed lines, how are they shown in UML ER (entity-relationship) diagram?
If I recall correctly UML leaves that at your discretion and does not discriminate between partial keys and other composite keys (the difference between weak and strong entities is less pronounced in E-R or UML).