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It s no mystery that a database is something that stores data. However, today s modern Relational Database Management Systems (RDBMS), such as PostgreSQL, MySQL, SQL Server, Oracle, DB2, and others, have extended this basic role by adding the capability to store and manage relational data. This is a concept that deserves some attention. So what does relational data mean It s easy to see that every piece of data ever written in a real-world database is somehow related to some already existing information. Products are related to categories and departments, orders are related to products and customers, and so on. A relational database keeps its information stored in data tables but is also aware of the relations between them. These related tables form the relational database, which becomes an object with a significance of its own, rather than simply being a group of unrelated data tables. It is said that data becomes information only when we give significance to it, and establishing relations with other pieces of data is an ideal means of doing so. Look at the product catalog to see what pieces of data it needs and how you can transform this data into information. For the product catalog, you ll need at least three data tables: one for departments, one for categories, and one for products. It s important to note that physically each data table is an independent database object, even if logically it s part of a larger entity in other words, even though we say that a category contains products, the table that contains the products is not inside the table that contains categories. This is not in contradiction with the relational character of the database. Figure 4-1 depicts a simple representation of three data tables, including some selected sample data.

Listing 16.12 KubrickCollection.java (continued)

Figure 4-23. Wait days in the row labels This level of detail may be required occasionally, but you could group the wait days, instead of listing each number individually. For example, you could list the days in groups of seven days, which would group the wait days into week lengths. This would give you a shorter list of items and would make it easier to spot which wait lengths are most common. 1. In the pivot table, select a cell in the Wait labels area, such as cell A5. 2. On the Ribbon, under the PivotTable Tools tab, click the Options tab. 3. In the Group group, click Group Field (see Figure 4-24).

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PdfDestination dest = new PdfDestination(PdfDestination.FIT); dest.addFirst(new PdfNumber(1)); PdfTargetDictionary intermediate; PdfTargetDictionary target; ... target = new PdfTargetDictionary(true); Final target target.setEmbeddedFileName(movie.getTitle()); intermediate = new PdfTargetDictionary(true); Intermediate intermediate.setFileAttachmentPage(1); target intermediate.setFileAttachmentIndex(1); intermediate.setAdditionalPath(target); action = PdfAction.gotoEmbedded(null, intermediate, dest, true);

Table with categories Name Christmas Hats Halloween Hats St. Patrick s Day Hats Berets Driving Caps Theatrical Hats Military Hats

The final target is a movie page that is the child of an intermediate target, namely the first attachment on page 2, which is the page with index 1. The next bit of code shows how this attachment was added.

Listing 16.13 KubrickCollection.java (continued)

Note The Group Field command is available only if the currently selected field is a number or date field.

When two tables are said to be related, this more specifically means that the records of those tables are related. So, if the products table is related to the categories table, this translates into each product record being somehow related to one of the records in the categories table. Figure 4-1 doesn t show the physical representation of the database, so we didn t list the table names there. Diagrams like this are used to decide what needs to be stored in the database. After you know what to store, the next step is to decide how the listed data is related, which leads to the physical structure for the database. Although Figure 4-1 shows three kinds of data that you want to store, you ll learn later that to implement this structure in the database, you ll actually use four tables. So, now that you know the data you want to store, let s think about how the three parts relate to each other. Apart from knowing that the records of two tables are related somehow, you also need to know the kind of relationship between them. Let s now take a closer look at the different ways in which two tables can be related.