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Database training
1.3.06. Relationships in the relational model
Two relations, A and B
A side, B side, 1 side, N side
1:1 relationships
Key can go on either side
1:N relationships
Key cannot go on 1 side
Has to go on N side
M:N relationships
Nowhere obvious for the key to go
Create new pairing relation
‹ 1.3.05. Relational cardinality
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1.3.07. Joins ›
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