A cattle breeder keeps track of his animals in a database. Each cow is impregnated and bears one calf, each year. What is the type of relationship between cows and calves?

Question

BlackTom AI · Accepted Answer

Restating the scenario helps set up the relationship: a cattle breeder tracks cows and their calves, with each cow giving birth to one calf each year. Over time, a single cow can produce multiple calves, and typically each calf has a single mother.
Option 1: '1:1' would mean each cow is associated with exactly one calf and each calf with exactly one cow at all times. This is not correct because a cow can have multiple calves across years, so the relationship is not limited to a single calf per cow.
Option 2: 'M:N' implies a many-to-many relationship where multiple cows could be linked to multiple calves and vice versa. In this domain, a given calf is linked to one birth mother (one cow), so this mutual many-to-many relationship does not hold.
Option 3: '1:M' expresses a one-to-many relationship where one cow can be linked to multiple calves. This aligns with the real-world scenario: a single cow may bear several calves over successive years, while each calf is produced by one specific cow.
Thus, Option 3 ('1:M') correctly captures the relationship between cows and calves in this context.

A cattle breeder keeps track of his animals in a database. Each cow is impregnated and bears one calf, each year. What is the type of relationship between cows and calves?单项选择题

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