Why is the zookeeper in the ER-MODEL ZOO in a relationship with the enclosures, if the zookeeper cares for the animals, I don't understand why the block diagram is not put somewhere else, such as near the block diagram "animal"
The cardinalities confuse me too, sometimes it says 1;m and other times 1;n , doesn't make sense
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The number of animal caregivers is 1:n and these care for an animal disease not related to this number, 1:m.
At the same time there are a number of animals 1:n in a cradle 1:.
This makes it possible for the animal nurses to be worn out. Their competence is just over the cradle with all the drum and on it, also with the animals in it. Probably because they also have to clean up the enclosure or something, not only to look at the animals.
This does not apply to the nurses. There is 1 animal caregiver for a whole number of animal health caregivers. Then again several (1:n) animal husbands are responsible for a single goat (1).
Apparently you have to read the charts. In Requirement Engineering we use the same notation for data structures.
Hello, I am the most helpful as soon as I can, and leave a compliment if that’s not a problem! I do not understand what is meant by “the number of animal caregivers is 1:n, and these care for an animal disease that is not related to this number, 1:m.”, what is meant for a number, and what is meant by the context? I’m sorry if the question sounds doof, do Abitur and have been learning for the computer science test for a week, but I haven’t got the difference between 1:n and 1:m yet.
There are a number of animal nurses, no matter how much (from me 1:n). And there is a number of cradles, also no matter how many (we say: 1:m). That the notation is written in this way, just 1:m and another 1:n, says that the number has no direct appendage; arbitrary, not determinable. In reality it is so that there are 25 animal nurses who have to share the assignment of 45 goats. Or there are 20 animal nurses who care for 32 walks. There is no recognizable relationship between m and n. And it varies and can change, depending on the need and the case of work.
so instead I could write 1:n everywhere, is not so complicated