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For the sample database, these rules probably make sense: Whenever a new order is taken, the SALES column for the salesperson who took the order and for the office where that salesperson works should be increased by the order amount Deleting an order or changing the order amount should also cause the SALES columns to be adjusted Whenever a new order is taken, the QTY_ON_HAND column for the product being ordered should be decreased by the quantity of products ordered Deleting an order, changing the quantity, or changing the product ordered should also cause corresponding adjustments to the QTY_ON_HAND column These rules fall outside the realm of SQL as defined by the SQL standard and as implemented by many SQL-based DBMS products today.

column of the SALES_DATES table. You want to start with the third character and extract eight characters. What parameters should you use in the SUBSTRING function

The DBMS takes responsibility for storing and organizing data and ensuring its basic integrity, but enforcing the business rules is the responsibility of the application programs that access the database Placing the burden of enforcing business rules on the application programs that access the database has several disadvantages: Duplication of effort If six different programs deal with various updates to the ORDERS table, each must include code that enforces the rules relating to ORDERS updates Lack of consistency If several programs written by different programmers handle updates to a table, they will probably enforce the rules somewhat differently..

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A LOCALTIMESTAMP B CURRENT_DATE C LOCALTIME D CURRENT_TIMESTAMP 9. What are four types of operators that you use in a numeric value expression 10. You are querying data from the CD_TRACKING table. You want to add values in

Maintenance problems If the business rules change, the programmers must identify every program that enforces the rules, then locate the code and modify it correctly. Complexity There are often many rules to remember. Even in the small sample database, a program that handles order changes must worry about enforcing credit limits, adjusting sales totals for salespeople and offices, and adjusting the quantities on hand. A program that handles simple updates can become complex very quickly. The requirement that application programs enforce business rules is not unique to SQL. Application programs have had that responsibility since the earliest days of COBOL programs and file systems. However, there has been a steady trend over the years to put more understanding of the data and more responsibility for its integrity into the database itself. In 1986, the Sybase DBMS introduced the concept of a trigger as a step toward including business rules in a relational database. The concept proved to be very popular, so support for triggers began to appear in many SQL DBMS products in the early 1990s, including those of the mainstream enterprise DBMS vendors. Triggers and the enforcement of business rules that they provide have been especially useful in enterprise database environments. When hundreds of application programs are being developed or modified every year by dozens of application programmers, the ability to centralize the definition and administration of business rules can be very useful.

Part VI:

the IN_STOCK column to values in the ON_ORDER column. You then want to double the column totals. How do you set up the numeric value expression

way down through the index layers If not, the block of data must be located on disk and brought into memory The same pattern repeats at each level of the index, with computation required to find the particular index entry within the block Finally, the index has been searched, and the virtual row-id of the correct row has been found Now the process repeats to locate the actual row of data The DBMS translates the virtual row-id into a physical location again it s a computationally intensive process The current blocks of data in the DBMS memory buffers are searched to determine if the required data is already in memory If so, the DBMS must also check to make sure that the contents of that particular block have not been invalidated by another program s updates.

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