1
one-to-one
one-to-many
many-to-one
✗
✓
2
one-to-one
one-to-many
many-to-one
✗
✓
3
one-to-one
one-to-many
many-to-one
✗
✓
4
one-to-one
one-to-many
many-to-one
✗
✓
5
one-to-one
one-to-many
many-to-one
✗
✓
6
one-to-one
one-to-many
many-to-one
✗
✓
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