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Chainarong Ngaosri
Chainarong Ngaosri

The document discusses different types of relationships in a relational database including one-to-one, one-to-many, and many-to-many. It also covers referential integrity, which ensures that relationships between tables are maintained through keys.

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5 2 5 ------------------------------------------------------------------------------------------------------------------------------- Relational 1.1 Database One-to-One Relationship 1 ? ?
Candidate Alternate Key Key
1006 60 4113 3102 6214 Foreign Key 1.2 One-to-Many Relationship 1 ?
2 1006
1.3 Many-to-Many Relationship
2101 - 2102 -- 2103 -- 2104 --- --------
-- 2. ¡ª Referential Integrity Access 2007
studentID Referential Integrity
Referential Integrity 6 divisionID Referential Integrity
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