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This means that

• Child rows cannot be added for parent rows that do not exist. In other words, an order cannot be added for a nonexistent customer.
• A primary key value cannot be modified if the value is used as a foreign key in a child table. This means that a CustomerID in the customers table cannot be changed if the orders table contains rows with that CustomerID...

This means that

• Child rows cannot be added for parent rows that do not exist. In other words, an order cannot be added for a nonexistent customer.
• A primary key value cannot be modified if the value is used as a foreign key in a child table. This means that a CustomerID in the customers table cannot be changed if the orders table contains rows with that CustomerID...

General points of the essay

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