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Figure 8-15: The logical model of an example database.
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CategoryName VARCHAR(20) NOT NULL
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8 Database Design Issues
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Take, for example, the following statements: All values entered in OrderItem.SalesOrderID must match values in SalesOrder.SalesOrderID. If a user deletes a SalesOrder, automatically delete all OrderItems related to it. If you formalize them as a DRI constraint the statements become the following code:
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ALTER TABLE OrderItem ADD CONSTRAINT FK__OrderItem_SalesOrder FOREIGN KEY (SalesOrderID) REFERENCES SalesOrder(SalesOrderID) ON DELETE CASCADE
Why is this statement called a declarative referential integrity constraint Because it declares the table s referential integrity behavior as part of the table definition itself, as opposed to implementing such behavior as a separate piece of executable computer code. We now break down this DRI constraint and look at what each phrase means, starting with the following:
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ALTER TABLE OrderItem ADD CONSTRAINT FK__OrderItem_SalesOrder
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SalesOrder CustomerType CustomerTypeCode (PK) char(3) NOT NULL CustomerTypeName varchar(20) NOT NULL SalesOrderID (PK) CustomerNumber (FK) SoldTo SaleDate Subtotal TaxRate TaxAmount Total int varchar(12) varchar(30) datetime numeric(12,2) numeric(12,4) numeric(12,2) numeric(12,2) NOT NULL NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL
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Customer CustomerNumber (PK) CustomerTypeCode (FK) CompanyName Lastname Firstname Middlename VARCHAR(12) NOT NULL char(3) NOT NULL varchar(30) NOT NULL varchar(20) NULL varchar(20) NULL varchar(20) NULL OrderItem
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ItemNumber (PK) SalesOrderID (PK)(FK) Description UnitPrice Quantity varchar(15) int varchar(40) numeric(12,2) int NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL
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Subscription CustomerNumber (PK)(FK) NewsletterCode (PK)(FK) StartDate datetime DurationMonths int Price numeric(12,2) varchar(12) char(3) NOT NULL NOT NULL NOT NULL
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InventoryItem NOT ItemNumber (PK) NULL varchar(15) NOT NULL ParentItemNumber (FK) varchar(15) Description varchar(15) UnitPrice numeric(12,2) NOT NULL NULL NOT NULL NOT NULL
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Figure 8-16: The physical model of this database, as deployed on Microsoft SQL Server 2000.
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SalesOrder CustomerType CustomerTypeCode (PK) CHAR(3) CustomerTypeName VARCHAR2(20) NOT NULL NOT NULL SalesOrderID (FK) CustomerNumber (FK) SoldTo SaleDate Subtotal TaxRate TaxAmount Total NUMBER(38,0) VARCHAR2(12) VARCHAR2(30) DATE NUMBER(12,2) NUMBER(12,4) NUMBER(12,2) NUMBER(12,2) NOT NULL NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL
Customer CustomerNumber (PK) CustomerTypeCode (FK) CompanyName Lastname Firstname Middlename VARCHAR2(12) NOT NULL CHAR(3) NOT NULL VARCHAR2(30) NOT NULL VARCHAR2(20) NULL VARCHAR2(20) NULL VARCHAR220) NULL
OrderItem
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InventoryItem ItemNumber (PK) VARCHAR2(15) NOT NULL ParentItemNumber (FK) VARCHAR2(15) NULL Description VARCHAR2(40) NOT NULL UnitPrice NUMBER(12,2) NOT NULL
ItemNumber (PK) SalesOrderID (PK)(FK) Description UnitPrice Quantity
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Figure 8-17: The physical model of this database, as deployed on Oracle 9i. The preceding phrase modifies the definition of the OrderItem child table to add the constraint object named FK__OrderItem_SalesOrder. This object contains the remaining three lines of code, which make up the actual instructions of the constraint, as follows:
FOREIGN KEY (SalesOrderID) REFERENCES SalesOrder(SalesOrderID)
This phrase is the meat and potatoes of the DRI constraint. It creates the restriction between the foreign key OrderItem.SalesOrderID and the primary key SalesOrder. SalesOrderID so that, for every value stored in OrderItem.SalesOrderID, an equal value must be stored in SalesOrder.SalesOrderID with which OrderItem.SalesOrderID can match. If any other value is attempted in OrderItem.SalesOrderID, the database throws an error and the attempt fails. Finally, the last line of the DRI constraint is as follows:
ON DELETE CASCADE
This line instructs the database to first delete all OrderItem rows related to a SalesOrder row that is about to be deleted. Without the ON DELETE CASCADE clause in this DRI constraint,
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8 Database Design Issues
attempting to delete a SalesOrder row with related OrderItem rows would throw an error, and no changes would be made to either table s contents. The first four lines of constraint code are standard DRI syntax supported by most database platforms. Some database platforms, such as SQL Server 2000 and Oracle 9i, support the ON DELETE CASCADE extension to the basic DRI syntax to facilitate these cascading deletes. For database platforms that do not support cascading deletes in DRI constraints, the cascading delete behavior must be implemented by using a separate piece of code that automatically executes whenever a user attempts to delete a SalesOrder row. Such a piece of automatically executing code is called a trigger.