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Extra info for Access 2002 Programming by Example
But with the first normal form, you have still not eliminated redundancy or inconsistency. 1 shows what can and cannot be done with the first normal form. 1: First Normal Form Capabilities Things You Can’t Do Things You Can Do Eliminate redundancy Eliminate inconsistency Have either repeated groups (of columns) or more than one value in the intersection of a row and a column (such as a cell in a spreadsheet) Have a primary key that is not composite Break the table down into smaller tables Establish a primary key (composite only) Eliminate repeating groups 16 Chapter 1: Planning and Designing Your Access Database Second Normal Form—Eliminate Redundancy For a table to be in second normal form, it must first be in first normal form.
Click Design View and then click OK to open the Show Table dialog box. Click A and then click the Add button. Double-click B so that you can see both methods to add tables. Choose Close. 9, later in the chapter. Notice that the Value field is automatically joined for you. NOTE You can turn the auto join feature on and off by clicking Tools, Options, Tables/Queries and then selecting (or deselecting) Enable Auto Join. 3. Double-click the Result field in the B table to copy it to the query grid. Notice that the “figure 8” one-to-many representation is missing.
This scenario, which is entirely possible, creates redundancy. But keep in mind that you are just stating the “norm” here. Perhaps that’s why these are called normal forms. Along the same lines, the Access 97 Developer’s Handbook, by Paul Litwin, Ken Getz and Mike Gilbert and published by Sybex, states that there are situations in which it is acceptable to denormalize. In these rare cases, there are general rules to follow to “break the rules” properly. These rules include documenting every step in the denormalization process and making the necessary adjustments in the application to avoid anomalies and inconsistencies.