The entity which participates in the 1:0+ relationship is the parent entity.
Is that correct?
Update:
The entity which participates in the 1:0+ relationship is the parent entity. Is that
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The entity which participates in the 1:0+ relationship is the parent entity.
Is that correct?
Update:
No, this is wrong.
In a 1:1 relationship, you just have one table. There’s no distinction. The attributes must apply to both types of entity.
However, in an optional 1:1 relationship, often called 1:0+ or “one to zero or one” relationship, the child would be the optional one, not the parent.
In short, there will always be a parent.
In your image, there’s an optional one-to-one from staff to notebook, i.e. a staff member may have zero notebooks or one notebook. There’s also a one-to-one relationship from notebook to staff, i.e. a notebook must have exactly one member of staff as an owner.
Here’s a diagram to help you understand: