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How Do You Implement One-to-one, One-to-many And Many-to-many Relationships While Designing Tables? |
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Answer» One-to-One relationship can be implemented as a single table and rarely as two tables with PRIMARY and foreign key relationships. One-to-Many relationships are implemented by SPLITTING the DATA into two tables with primary key and foreign key relationships. Many-to-Many relationships are implemented using a junction table with the keys from both the tables FORMING the composite primary key of the junction table. One-to-One relationship can be implemented as a single table and rarely as two tables with primary and foreign key relationships. One-to-Many relationships are implemented by splitting the data into two tables with primary key and foreign key relationships. Many-to-Many relationships are implemented using a junction table with the keys from both the tables forming the composite primary key of the junction table. |
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