John Petersen's Absolute beginner's guide to databases PDF

By John Petersen

ISBN-10: 0768654769

ISBN-13: 9780768654769

ISBN-10: 078972569X

ISBN-13: 9780789725691

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 supplies particular palms on perform, but in addition presents an summary of designing, holding and utilizing a database. This e-book 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, ameliorations in forms of databases, and indexes--what they're, how we use them, and why they're important.

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The maximum size of a validation text property is 255 characters. Required The Required property specifies whether a data value is required for the field. Allow Zero Length The Allow Zero Length property specifies whether a zerolength string is a valid entry. This property applies only to text, memo, and hyperlink fields. Indexed The Indexed property specifies whether an index is created for the field. Two types of indexes can be created. One allows duplicate field entries, and the other type does not allow duplicates.

12 The database model is now complete with entities, foreign keys, and relationships. So, why do they call it a “crow’s foot” model? 13 shows why the model has this seemingly corny name.

17 demonstrates how a report brings a query to life. 17 The Products by Category report in Print Preview View. CHAPTER 2 THE ANATOMY OF A REAL DATABASE 37 The structure of a report is a bit more complicated than the structure of tables and queries. 18 shows the Products by Category report in Design View. ” Forms The final Access database objects to examine in this quick overview are forms. You have seen where data is stored (tables), how data can be combined in a useful format (queries), and how data can be presented in a useful format (reports).

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Absolute beginner's guide to databases by John Petersen

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