By John Petersen
Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the genuine newbie. It not just provides particular arms on perform, but additionally presents an outline of designing, holding and utilizing a database. This ebook covers what databases are used for, why databases are vital, why the layout of the database is critical, database normalization, keys to sturdy 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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Htm. For purposes of illustrating database modeling and related notation, this book uses Microsoft Visio. Creating Your First Model Let’s take a step back and start with a fleshed-out design to get you familiar with how to create a graphical database model. In this hypothetical situation, you have identified the following entities: ■ Customers ■ Orders ■ Order Line Items Note All the concepts in this section can be employed with tools as simple as a piece of paper and a pencil. Graphical and automated design tools do make some jobs easier, such as ensuring foreign keys are created in child tables and deciphering whether a one-to-one or one-to-many relationship is involved.
As you will see in the next chapter, whether you elect to have some fields stored in one entity over another is optional, but the fields at this level are not optional. That is why these fields are discussed in this section. Simply put, if you don’t have foreign key fields, you can’t have relationships. Relationships, after all, are the heart of a relational database. 12. 12 The database model is now complete with entities, foreign keys, and relationships. So, why do they call it a “crow’s foot” model?
So, avoid the use of spaces in field names. Caution DataType The DataType property specifies the type of data stored in the field. 1. 1 Standard Data Types Supported by Access Data Type Description Maximum Size Text Character data 255 bytes Memo Character data 64K Number Numeric data 8 bytes Date/Time Date and time data 8 bytes Currency Monetary data 8 bytes Autonumber Autoincrementing numeric data 4 bytes Yes/No True/False logical data 1 bit Note Access supports additional data types, including OLE Object and Hyperlink.