Add Foreign Key « Constraints « Oracle PL / SQL

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Oracle PL / SQL » Constraints » Add Foreign Key 
1.Add Foreign Primary Key
2.Alter table to add primary key and alter another table to add foreign key
3.syntax to reference foreign key
4.Many to many using a primary-key and foreign-key relationship
5.Three foreign keys in a table
6.One to many using a primary-key and foreign-key relationship
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