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Obviously, the number of columns and the data types of the columns in the foreign key and the primary key must be identical to one another A table can contain more than one foreign key if it is related to more than one other table Figure 4-10 shows the three foreign keys in the ORDERS table of the sample database: The CUST column is a foreign key for the CUSTOMERS table, relating each order to the customer who placed it The REP column is a foreign key for the SALESREPS table, relating each order to the salesperson who took it The MFR and PRODUCT columns together are a composite foreign key for the PRODUCTS table, relating each order to the product being ordered The multiple parent/child relationships created by the three foreign keys in the ORDERS table may seem familiar to you, and they should.

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They are precisely the same relationships as those in the network database of Figure 4-4 As the example shows, the relational data model has all of the power of the network model to express complex relationships..

I FOR EACH ROW. The trigger fires repeatedly, once as each row affected by the change is being modified. Both the old and new data values for the row are available to the trigger. An individual trigger definition can specify actions to be taken at one or more of these steps. For example, a trigger could execute a stored procedure to calculate the sum of all orders BEFORE an update, monitor updates to each ORDERS row as they occur with a second action, and then calculate the revised order total AFTER the update with a call to another stored procedure. Here is a trigger definition that does all of this:

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FIGURE 4-10

create trigger upd_ord update of amount on orders referencing old as pre new as post /* Calculate order total before changes */ before (execute procedure add_orders() into old_total;) /* Capture order increases and decreases */ for each row when (post.amount < pre.amount) /* Write decrease data into table */ (insert into ord_less values (pre.cust, pre.order_date, pre.amount, post.amount);) when (post.amount > pre.amount) /* Write increase data into table */ (insert into ord_more values (pre.cust, pre.order_date, pre.amount, post.amount);) /* After changes, recalculate total */ after (execute procedure add_orders() into new_total;)

Foreign keys are a fundamental part of the relational model because they create relationships among tables in the database. As with primary keys, foreign key support was missing from early relational database management systems. They were added to DB2 Version 2, were subsequently added to the ANSI/ISO standard, and now appear in all of the major commercial products.

The BEFORE clause in this trigger specifies that a stored procedure named ADD_ORDERS is to be called before any UPDATE statement processing occurs. Presumably, this procedure calculates the total orders and returns the total value into the local variable OLD_TOTAL. Similarly, the AFTER clause specifies that a stored

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The primary key has a different unique value for each row in a table, so no two rows of a table with a primary key are exact duplicates of one another. A table where every row is different from all other rows is called a relation in mathematical terms. The name "relational database" comes from this term, because relations (tables with distinct rows) are at the heart of a relational database. Although primary keys are an essential part of the relational data model, early relational database management systems (System/R, DB2, Oracle, and others) did not provide explicit support for primary keys. Database designers usually ensured that all of the tables in their databases had a primary key, but the DBMS itself did not provide a way to identify the primary key of a table. DB2 Version 2, introduced in April 1988, was the first of IBM's commercial SQL products to support primary keys. The ANSI/ISO standard was subsequently expanded to include a definition of primary key support.

Codd s 12 Rules for Relational Databases*

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