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 UWA week 39 (2nd semester, week 9) ↓
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12:34pm Tue 24th Sep, ANONYMOUS

In the lectures it was stated that a bridging table that represents the relationship and its attributes should be made if there is a many to many (*:*) relationship, such as that between vehicleType and dailyTariff in the Projects ER Diagram. However, in that situation participation is not mandatory and therefore the values that would make the primary key for this bridging table could be null, which is impossible. Have I misunderstood this?


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1:50pm Tue 24th Sep, Mengxi L.

You can have a look at Week 7 slide, these are very helpful.



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