Tuesday, April 12, 2011

One-to-Many and Many-to-Many relationships while designing tables?

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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