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Foreign key statement in mysql
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Foreign key statement in mysql


Date:16.05.2016, 17:26 Disclaimer! For the purpose of this example, we will create two simple database tables. They are not well designed, but will demonstrate the power of foreign keys! employee : a table of company employees where each member is assigned a unique ID borrowed : a table of borrowed books. Fortunately, the lesser-used InnoDB table type does support foreign keys: this article will show how they could reduce your coding effort and increase data integrity. What are Foreign Keys? A foreign key establishes a relationship, or constraint, between two tables. A primary key column cannot contain NULL values. It means that you have to declare the primary key column with the NOT NULL  attribute. If you dont, MySQL will force the primary key column as NOT NULL  implicitly.
Foreign key statement in mysql


Foreign key statement in mysql Foreign key statement in mysql


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