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When you specify a table name in a SQL statement, SQL assumes that you are referring to one of your own tables (that is, a table that you created). Usually, you will want to choose table names that are short but descriptive. The table names in the sample database (ORDERS, CUSTOMERS, OFFICES, SALESREPS) are good examples. In a personal or departmental database, the choice of table names is usually up to the database developer or designer. In a larger, shared-use corporate database, there may be corporate standards for naming tables, to insure that table names do not conflict. In addition, most DBMS brands allow different users to create tables with the same name (that is, both Joe and Sam can create a table named BIRTHDAYS). The DBMS uses the appropriate table, depending on which user is requesting data. With the proper permission, you can also refer to tables owned by other users, by using a qualified table name. A qualified table name specifies both the name of the table s owner and the name of the table, separated by a period (.). For example, Joe could access the BIRTHDAYS table owned by Sam by using the qualified table name:

Primary key changes in the parent table thus cause a set to DEFAULT update on selected columns of the child table For the tables in Figure 11-1, this rule can be summarized as If an office number is changed, automatically change the office assignment of its salespeople to the default office specified in the definition of the SALESREPS table The RESTRICT update rule is a naming convention used by DB2 and a few other implementations; the SQL2 standard again calls this update rule NO ACTION As with the update rules, support for the delete rules varies among SQL implementations Table 11-2 shows which rules are supported in current versions of popular DBMS products You can specify two different rules as the delete rule and the update rule for a parent/ child relationship, although in most cases, the two rules will be the same.

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If you do not specify a rule, the RESTRICT rule is the default, because it has the least potential for accidental destruction or modification of data Each of the rules is appropriate in different situations If, for example, we wanted to set the delete rule to SET NULL and the update rule to CASCADE for the HASMGR constraint between the SALESREPS and OFFICES table, we could use this ALTER TABLE statement to create the constraint instead of the one shown in Appendix A:.

On a high-volume web site, database access can become a bottleneck to overall web site performance. Because of the EJB structure, the database access required by the business logic of the application is increased (perhaps substantially) by the database access required to support entity bean/database synchronization. If the web site implements heavy personalization of its user interaction (i.e., if a high percentage of its pages are dynamically generated based on the profile of the particular user who is viewing

ALTER TABLE OFFICES ADD CONSTRAINT HASMGR FOREIGN KEY (MGR) REFERENCES SALESREPS(EMPL_NUM) ON UPDATE CASCADE ON DELETE SET NULL;

22:

A SQL function does return a value. It is called just like a built-in SQL function within a value expression:

them), then the database access load can be even higher At the extreme, every click on a highly personalized web site could require retrieval of user-profile data from the database to drive page generation Finally, user interaction with a web site happens in real time, and is affected by peak-load activity The average rate of click processing is less important than peak-load activity in determining whether users perceive the site as fast or sluggish The World Wide Web has already shown an effective architecture for dealing with these types of peak-load Internet volume demands through web page caching and horizontal scaling With caching, copies of heavily accessed web pages are pulled forward in the network and replicated As a result, the total network capacity for serving web pages is increased, and the amount of network traffic associated with those page hits is reduced.

Here is an example of a valid query using DB2 dates, assuming that the HIREDATE column contains DATE data: SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '05/30/1989' + 15 DAYS SQL Server provides a single date/time data type, called DATETIME, which closely resembles the DB2 TIMESTAMP data type If HIRE_DATE contained DATETIME data, SQL Server could accept this version of the query (without the date arithmetic): SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '06/14/1989' Since no specific time on June 14, 1989, is specified in the query, SQL Server defaults to midnight on that date.

SELECT COMPANY FROM CUSTOMERS WHERE GET_TOT_ORDS(CUST_NUM) > 10000.00;

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