By Bob Villareal
The e-book covers basics reminiscent of database normalization, question layout, item manipulation and optimization, and customized programming for varieties and reviews. The reader becomes extra effective, effective, and an expert in entry VBA. This ebook bargains with getting facts from outdoors assets and utilizing VBA to make sure information integrity and consistency, which no different entry VBA publication does. It additionally tackles difficulties in quite a few day by day occasions that programmers frequently face.
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Extra info for Access 2002 Programming by Example
8: To be in second normal form, you cannot have any partial dependencies. PARTIAL DEPENDENCIES A partial dependency depends on only part of the primary key rather than on the entire primary key. Therefore, if you have a composite key, there is a good chance that you have partial dependencies and are in first normal form. 8 that the Employee Name is fully dependant on Employee ID, rather than being dependent on Employee ID and some other field making up a composite. 8, which is a second normal form example, does not contain any partial dependencies.
These rules include documenting every step in the denormalization process and making the necessary adjustments in the application to avoid anomalies and inconsistencies. INCONSISTENT DATA Redundancy creates anomalies and anomalies create inconsistencies. Suppose you have order numbers for which there is no customer. This happens if the Customer table is not linked and a customer number has changed, or if the customer’s information is deleted from an Orders table. This customer’s orders are like “lost data” floating around, taking up space without a link.
This is acceptable to maintain the one-to-many relationship. The second is in the State Code field in the Client ID table. This is also acceptable since it can be maintained as a lookup if needed. The “many” side of a one-to-many relation or the “one” side of a many-to-one relation are both acceptable field values to duplicate since we are only talking about one field. The whole idea is to conserve space by using one field to link to as much information in related tables as you need. 9 that the State Code lookup field in the Clients table is left as a link.
Access 2002 Programming by Example by Bob Villareal