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Figure 8-8: The solution is provided by an identifying relationship. Because the relationship between the SalesOrder and OrderItem tables contributed something (the foreign key OrderItem.SalesOrderID) that is used to uniquely identify each row in the OrderItem table, it is considered an identifying relationship, as shown in Figure 8-9. In other words, if a foreign key in a table is also part of the primary key for that same table, the relationship that contributed the foreign key is an identifying relationship.

Optionality describes whether a relationship must exist between all rows in the child table and one or more rows in the parent table. Take, for example, the Customer and SalesOrder entities and the relationship between them, as shown in Figure 8-10. Say that you use a common database to store sales transactions from both your physical storefront and your Web site. Storefront sales orders are for walk-in sales, for which you don t need to gather customer information, but online sales are handled differently. The user enters the information necessary to ship his online order during the checkout process. If the purchaser is new to your Web site, you want to automatically create a customer record for him and then relate the sales order to this newly created customer. If the purchaser is a returning customer who has logged in, you want to retrieve his customer record and automatically fill his customer information in the entry form that appears during the checkout process.

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Identifying Relationship SalesOrder SalesOrderID INTEGER VARCHAR(30) DATETIME NUMERIC(12,2) NUMERIC(12,4) NUMERIC(12,2) NUMERIC(12,2) NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL SoldTo SaleDate Subtotal TaxRate TaxAmount Total

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Customer CustomerNumber VARCHAR(12) NOT NULL CustomerTypeCode (FK) CHAR(3) NOT NULL CompanyName VARCHAR(30) NOT NULL Lastname VARCHAR(20) NULL Firstname VARCHAR(20) NULL Middlename VARCHAR(20) NULL

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OrderItem ItemNumber VARCHAR(15) NOT NULL SalesOrderID (FK) INTEGER NOT NULL Description UnitPrice Quantity VARCHAR(40) NOT NULL NUMERIC(12,2) NOT NULL INTEGER NOT NULL

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Figure 8-9: An identifying relationship contributes a foreign key that is also part of the child entity s primary key. So some sales orders are related to a customer, and some are not. The relationship between Customer and SalesOrder, therefore, is an optional relationship. What this means is that the value of the foreign key SalesOrder.CustomerNumber may be NULL, or it may contain a matching value in the CustomerNumber column from a row in the Customer table, but no other values are possible.

Customer CustomerNumber 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

SalesOrder SalesOrderID CustomerNumber (FK) SoldTo SaleDate Subtotal TaxRate TaxAmount Total INTEGER 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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Figure 8-10: By allowing NULL values in the foreign key, an optional relationship enables instances of the child entity to either have related parent instances or not have them at all.

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The relationship between the CustomerType and Customer tables is a different story, as shown in Figure 8-11. Every customer must be of a specific customer type, so every value in Customer.CustomerTypeCode must match an existing value in CustomerType. CustomerTypeCode. The relationship between the CustomerType and Customer tables, therefore, is a mandatory relationship. For this reason, the value of Customer. CustomerTypeCode cannot be NULL.

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Customer CustomerNumber VARCHAR(12) NOT NULL CustomerTypeCode(FK) CHAR(3) NOT NULL CompanyName VARCHAR(30) NOT NULL Lastname VARCHAR(20) NULL Firstname VARCHAR(20) NULL Middlename VARCHAR(20) NULL

Figure 8-11: In a mandatory relationship, every child instance must have a parent instance to which it is related. Contrast and compare the Nullability of the foreign-key columns in the Customer and SalesOrder tables. If a foreign key is Nullable, the relationship that contributed it is an optional relationship. If a foreign key disallows NULL values, the relationship that contributed it is a mandatory relationship

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