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what should happen to the two child rows in the SALESREPS table that represent salespeople from the Los Angeles office. Again, there are four logical possibilities: I Prevent the office number from being changed until the salespeople are reassigned. In this case, you should first add a new row to the OFFICES table with the new office number for Los Angeles, then update the SALESREPS table, and finally delete the old OFFICES row for Los Angeles. I Automatically update the office number for the two salespeople in the SALESREPS table, so that their rows are still linked to the Los Angeles row in the OFFICES table, via its new office number. I Set the REP_OFFICE column for the two salespeople to NULL, indicating that their office assignment is unknown. I Set the REP_OFFICE column for the two salespeople to some default value, such as the office number for the headquarters office in New York, indicating that the salespeople are automatically reassigned to that office. Although some of these alternatives may seem more logical than others in this particular example, it s relatively easy to come up with examples where any one of the four possibilities is the right thing to do, if you want the database to accurately model the real-world situation. The SQL1 standard provided only the first possibility for the preceding examples it prohibited the modification of a primary key value that was in use and prohibited the deletion of a row containing such a primary key. DB2, however, permitted other options through its concept of delete rules. The SQL2 standard has expanded these delete rules into delete and update rules that cover both deleting of parent rows and updating of primary keys.

For this reason, most commercial DBMS products include a bulk load feature that loads data from a file into a table at high speed The ANSI/ISO SQL standard does not address this function, and it is usually provided as a stand-alone utility program rather than as part of the SQL language Each vendor s utility provides a slightly different set of features, functions, and commands When SQL is used from within an application program, another technique is frequently provided for more efficiently inserting a large amount of data into a database The standard programmatic INSERT statement inserts a single row of data, just like the interactive singlerow INSERT statements in the preceding examples But many commercial DBMS products allow data from two or more rows (often up to hundreds of rows) to be supplied as part of a single bulk INSERT statement.

Delete and Update Rules *

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All of the supplied data must be for new rows of the single table that is the target of the INSERT statement, and named in the INTO clause Executing a bulk INSERT statement for 100 rows of data has exactly the same effect as executing 100 individual single-row INSERT statements However, it is usually much more efficient, because it involves only one call to the DBMS When thousands of rows are loaded, the performance gain can be an order of magnitude or more..

For each parent/child relationship created by a foreign key in a database, the SQL2 standard allows you to specify an associated delete rule and an associated update rule. The delete rule tells the DBMS what to do when a user tries to delete a row of the parent table. These four delete rules can be specified: I RESTRICT delete rule. The RESTRICT delete rule prevents you from deleting a row from the parent table if the row has any children. A DELETE statement that attempts to delete such a parent row is rejected with an error message. Deletions from the parent table are thus restricted to rows without any children. Applied to Figure 11-1, this rule can be summarized as You can t delete an office if any salespeople are assigned to it. I CASCADE delete rule. The CASCADE delete rule tells the DBMS that when a parent row is deleted, all of its child rows should also automatically be deleted from the child table. For Figure 11-1, this rule can be summarized as Deleting an office automatically deletes all the salespeople assigned to that office.

A row of data is typically deleted from a database when the entity represented by the row disappears from the outside world. For example, in the sample database: When a customer cancels an order, the corresponding row of the ORDERS table must be deleted. When a salesperson leaves the company, the corresponding row of the SALESREPS table must be deleted. When a sales office is closed, the corresponding row of the OFFICES table must be deleted. If the salespeople in the office are terminated, their rows should be deleted from the SALESREPS table as well. If they are reassigned, their REP_OFFICE column values must be updated.

13 - Creating a Database - 256 14 - Views - 290 15 - SQL Security - 304

11:

10:

FIGURE 10-5

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