By John Petersen
Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just supplies particular fingers on perform, but in addition presents an outline of designing, keeping and utilizing a database. This publication covers what databases are used for, why databases are vital, why the layout of the database is critical, database normalization, keys to stable database layout, modifications in forms of databases, and indexes--what they're, how we use them, and why they're important.
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Extra resources for Absolute beginner's guide to databases
Just because you create that first design does not mean the requirements-gathering process is complete. Remember, you might have to repeat the process two, three, or perhaps four or more times to achieve that first database design. As you gain experience, the process will become more familiar to you. At this point, you have an understanding of where sources of information can be found for requirements gathering. The question now is how do you put an initial design together. The answer is in the form of a database model.
The lookups involve the SupplierID and CategoryID fields. If you recall from the beginning of this chapter, these foreign key fields point to the Supplier and Category tables, respectively. Information supporting how this information will be displayed in a form can be found in the Lookup tab of the Table Designer. 21. 21 The Lookup tab provides the information and user interface components used to support form construction. Lookup tab Field Properties Lookups are easier for users to work with because users can work with descriptions instead of the meaningless numerical key values.
A drawing on a piece of paper can be just as effective as a diagram produced with a tool costing thousands of dollars. Okay, maybe that is a bit of a stretch. Still, you don’t have to take out a second mortgage to afford a good design tool. Two very affordable tools are on the market today: ■ Microsoft Visio—Since the Microsoft acquisition, Visio has shipped as part of the Microsoft Office Suite. com/office/visio/. ■ Resolution xCase—This is a full-featured database design tool that works with SQL Server, Access, Sybase, Informix, DB2, and many other databases on the market today.