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Just as home builders have an architectural diagram or blueprint, which enables them to communicate clearly and objectively about what they are going to build, so do relational database builders. In our case, the architectural diagram is called an entity-relationship diagram (ERD). Figure 1-1 is an ERD for the tables shown in Tables 1-1 and 1-2, now named author and publication. It shows that one author may have zero or more publications. Additionally, it shows that an author s ID is his primary key (PK), or unique way to identify him, and an author s primary key is also used to identify his publications.

Figure 1-1. An entity-relationship diagram for the author and publication tables ERDs, like blueprints, may have varying levels of detail, depending on your audience. For example, to simplify the ERD in Figure 1-1, I ve left out the data types. In an ERD, the tables are called entities. The lines that connect the tables I mean entities are called relations. So given an ERD, or even a narrative documentation as in Table 1-3, you can write a script to create a table.

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This was a long exercise, wasn t it And yet, to make the most out of it, you still need to go through a few more exercises to implement tax and shipping charges. At that moment, all your customer-handling functionality will be completed, and you ll only be left with adding an order pipeline and credit card processing support. Load your web site to make sure your newly added code works, and then proceed by adding tax and shipping charges support.

If none of these options give you exactly what you need, you might want to explore adding an Office web part to a SharePoint page. The Office web parts, which include Office Spreadsheet, Office Datasheet, Office PivotTable, Office PivotChart, and Office PivotView Web Parts, give you Excel functionality right on a SharePoint page. You can use the Office web parts to create dynamic dashboards, such as the one shown in Figure 9-1, based on data housed in one of three places: In an existing SharePoint list In an external data source, such as a SQL Server or Access database Entered directly into the Spreadsheet Web Part

Data Definition Language (DDL)

One feature that is common to many e-commerce web sites is adding charges for tax and/or shipping. Obviously, this isn t always the case digital download sites have no need to charge for shipping, for example, because no physical shipment is involved. However, you ll probably want to include additional charges of one kind or another in your orders. In fact, this can be very simple, although not always. It really depends on how complicated you want to make things. In this chapter, we ll keep things simple and provide basic but extensible functionality for both tax and shipping charges. First, let s discuss the issues.

To create the author table, as defined in Table 1-3, in Oracle, you ll need to create a SQL script (for SQL*Plus) that in SQL jargon is called Data Definition Language (DDL). That is, it s SQL for defining the relational database. Listing 1-1 shows our author table s DDL. Listing 1-1. DDL for Creating the Author Table, author.tab 1 2 3 4 5 CREATE TABLE author ( id name birth_date gender

The subject of tax and e-commerce web sites has a complicated history Early on, you could usually get away with anything Taxing was poorly enforced, and many sites simply ignored tax completely This was especially true for international orders, where it was often possible for customers to avoid paying tax much of the time unless orders were intercepted by customs officers! Then more people started to become aware of e-commerce web sites, taxation bodies such as the IRS realized that they were losing a lot of money or at least not getting all that they could A flurry of activity ensued as various organizations worldwide attempted to hook into this revenue stream A range of solutions was proposed; some solutions were implemented with mixed results Now, things are becoming a little more settled The key concept to be aware of when thinking about tax is a nexus.

Figure 9-1. A business dashboard can put critical information at the fingertips of the people who need it. Data entered into the spreadsheet is immediately reflected in the adjacent chart.

number, varchar2(100), date, varchar2(30) );

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