Access database design and programming by Steven Roman
By Steven Roman
I've been utilizing entry and VBA for many years, with none formal education in relational database or programming. during this concise e-book, Steven Roman controlled to offer a robust beginning within the conception of relational databases, VBA and DAO.
Armed with this information, I now have the arrogance to dig deeper in those 3 themes and research extra complex material.
One draw back notwithstanding: i discovered the final a part of the publication on ADO rather complicated. Steven Roman prefers DAO to ADO and it shows.
I however supply the booklet five stars, because the first 3 elements of the e-book are stellar.
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However, this definition belies the fact that the tables also model the relationships between the entity classes, as we will see. 2 A Short Glossary To help keep the various database terms clear, let us collect their definitions in one place: Entity An object about which the database is designed to store information. 00 Attribute A property that (partially or completely) describes an entity. Example: title. 33 TEAM FLY PRESENTS Entity class An abstract group of entities, with a common description.
For illustration purposes, we have changed the Publishers data, to include a city column. The file on the left is the index file and indexes the Publishers datafile by the City field, which is therefore called theindexed field. The city file is called an index for the PUBLISHERS table. (The index file is not a table in the same sense as the PUBLISHERS table is a table. ) The index file contains the cities for each publisher, along with a pointer to the corresponding data record in the Publishers file.
For this to be useful, we must translate the abstract model into a concrete one. That is, we must describe each aspect of the model in the concrete terms that a database program can manipulate. In short, we must implement the E/R model. This requires implementing several things: • • • • The entities The entity classes The entity sets The relationships between the entity classes The result of this implementation is a relational database. As we will see, implementing the relationships usually involves some changes to the entity classes, perhaps by adding new attributes to existing entity classes or by adding new entity classes.