birt ean 128

birt gs1 128

birt ean 128

birt gs1 128

birt ean 128

birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,

birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,

birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt ean 128,

In the case of companies, this means that using the hierarchy bridge to roll up orders requires selecting a single company to which they will be rolled up, or group results by company Once again, this is an example of an impact report It will likely be difficult to configure a business intelligence tool to generate SQL that meets these requirements Even highly experienced developers may err, so once again a safe configuration is called for In this case, the safe query environment does not involve the bridge at all; the dimension in question is linked directly to the fact table Experienced developers can make use of a separate environment that exposes the bridge For the star involving a hierarchy bridge, the story does not end here.

The key to managing your hardware storage devices is understanding the Disk Administrator program. To run this application, click the Disk Administrator icon in the Administrative Tools program group. The default screen looks like the one shown in Figure 3-10.

There is at least one other configuration of tables that may be useful: one that allows facts to be summarized by looking up the hierarchy, rather than down For example, it might be useful to choose a company and see whether any sales occurred at or above it in the hierarchy As you learned in 10, this involves reversing the way in which the bridge table is joined to the fact table and dimension table If you are using a business intelligence tool, this means that a third semantic layer will be called for Figure 16-11 illustrates the possibilities TIP A hierarchy bridge table, used incorrectly, leads to double-counting For novice users, prevent business intelligence software from generating inaccurate queries by omitting the bridge They will not be able to leverage the hierarchy but will be prevented from producing inaccurate reports.

CREATE TABLE ORDERS (ORDER_NUM INTEGER NOT NULL, ORDER_DATE DATE NOT NULL, CUST INTEGER NOT NULL, REP INTEGER, MFR CHAR(3) NOT NULL, PRODUCT CHAR(5) NOT NULL, QTY INTEGER NOT NULL, AMOUNT MONEY NOT NULL, PRIMARY KEY (ORDER_NUM), CONSTRAINT PLACEDBY FOREIGN KEY (CUST) REFERENCES CUSTOMERS.

NOTE: The first time you use Disk Administrator, you will be told that the program needs to add information to the drive. This is a safe process and is used by Windows NT to uniquely identify each disk in your system (since drive labels, locations, and boot status can all be changed).

Expert developers will require two additional configurations, one used for looking down the hierarchy, the other for looking up In addition to these three basic configurations, there are other possibilities The many-tomany relationship in either expert configuration can be resolved by inserting an additional alias for the bridged table In the case of looking down from a company, this additional instance of the company table would represent the subordinate, or child company In the case of looking upward from a subordinate, it would represent the superior company, or parent These configurations were illustrated in Figures 10-11 and 10-12, and represent the potential for still more semantic layers A developer may also desire to produce a report looking for transactions above or below a group of companies, rather than a single company This kind of question, which was.

- 262 -

The graphical display of Disk Administrator shows you the relationship between the physical drives and logical partitions on your system. Figure 3-10 shows a configuration

For more information on the design of operational systems, there is no finer reference than Chris Date s An Introduction to Database Systems, Eighth Edition (Addison Wesley, 2003). This book fully explains the principles of normalization used to support transaction processing in a relational database management system. A wealth of information is available on the differences between operational and analytic systems. Two good places to start are 1 of Ralph Kimball and Margy Ross s The Data Warehouse Toolkit, Second Edition (Wiley, 2002) and Inmon, Imhoff, and Sousa s discussion in The Corporate Information Factory, Second Edition (Wiley, 2000). For more information on separating facts from dimensions, you can consult any book on dimensional design. Data Warehouse Design Solutions (Adamson and Venerable; Wiley, 1995) and Mastering Data Warehouse Aggregates (Adamson; Wiley, 2006) both cover the topic in their opening chapters, as does Kimball and Ross s The Data Warehouse Toolkit. These books also cover the prototypical query pattern for a star schema; the browse query is discussed in The Data Warehouse Toolkit.

32 2

Figure 3-10.