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I Referential integrity constraints ensure that relationships among entities in the database are preserved during database updates. I The SQL2 standard and newer implementations provide extensive referential integrity support, including delete and update rules that tell the DBMS how to handle the deletion and modification of rows that are referenced by other rows. I Business rules can be enforced by the DBMS through the trigger mechanism popularized by Sybase and SQL Server. Triggers allow the DBMS to take complex actions in response to events such as attempted INSERT, DELETE, or UPDATE statements. Check constraints provide a more limited way to include business rules in the definition of a database and have the DBMS enforce them.

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44. When forming DML statements, the following types of constraints must be considered: a. Referential constraints b. Primary key constraints c. NOT NULL constraints d. Unique constraints e. Security constraints 45. An INSERT statement with a VALUES clause a. May use the keyword NULL to assign null values to columns b. Can insert multiple rows with one statement execution c. Must have a column list d. Must have a values list e. May include a WHERE clause 46. An UPDATE statement without a WHERE clause a. Fails with an error condition b. Results in a Cartesian product c. Updates all rows in the table to null values d. Attempts to update every row in the table e. Deletes all rows in the table 47. An UPDATE statement a. Must include a WHERE clause b. May set a column to the value of another column c. May set columns of multiple tables to new values d. Must include a SET clause e. Must provide a new value for at least one column

atabase updates are usually triggered by real-world events, such as the receipt of a new order from a customer. In fact, receiving a new order would generate not just one, but this series of four updates to the sample database:

Table 10-1

I Add the new order to the ORDERS table. I Update the sales total for the salesperson who took the order. I Update the sales total for the salesperson s office. I Update the quantity-on-hand total for the ordered product. To leave the database in a self-consistent state, all four updates must occur as a unit. If a system failure or another error creates a situation where some of the updates are processed and others are not, the integrity of the database will be lost. Similarly, if another user calculates totals or ratios partway through the sequence of updates, the calculations will be incorrect. The sequence of updates must thus be an all-or-nothing proposition in the database. SQL provides precisely this capability through its transaction-processing features, which are described in this chapter.

A transaction is a sequence of one or more SQL statements that together form a logical unit of work. The SQL statements that form the transaction are typically closely related and perform interdependent actions. Each statement in the transaction performs some part of a task, but all of them are required to complete the task. Grouping the statements as a single transaction tells the DBMS that the entire statement sequence should be executed atomically all of the statements must be completed for the database to be in a consistent state. Here are some examples of typical transactions for the sample database, along with the SQL statement sequence that comprises each transaction: I Add-an-order. To accept a customer s order, the order-entry program should (a) query the PRODUCTS table to ensure that the product is in stock, (b) insert the order into the ORDERS table, (c) update the PRODUCTS table, subtracting the quantity ordered from the quantity-on-hand of the product, (d) update the SALESREPS table, adding the order amount to the total sales of the salesperson who took the order, and (e) update the OFFICES table, adding the order amount to the total sales of the office where the salesperson works. I Cancel-an-order. To cancel a customer s order, the program should (a) delete the order from the ORDERS table, (b) update the PRODUCTS table, adjusting the quantity-on-hand total for the product, (c) update the SALESREPS table, subtracting the order amount from the salesperson s total sales, and (d) update the OFFICES table, subtracting the order amount from the office s total sales.

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