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Extra resources for ACTUALTESTS ORACLE 1Z0-007 EXAMCHEATSHEET V12 10 04
Example text
MDE and MDW Files You’ll see other extensions, such as MDE and MDW. They are also Access files, but they’re beyond the scope of this book. Briefly, MDE files are compiled databases in which the tables, forms, reports, etc. can no longer be changed. They’re good for distributing a finished database. MDW files are part of Access security. The preferred name for the window in Figure 4-4 is database window. I’ll refer to it that way throughout the book. Setting Options I’m going to take a slight detour here.
Therefore, to add the new baby to my family and friends database, I either have to allow null values for first names, or make up a fake first name for her. I don’t know what her name is, but I do know she has one! That’s a null value.
Table 3-4: Entities and Key Attributes Entity Definition Example Key Attribute(s) Household Group of people who reside at a single location Tom & Cindy Hepworth household Household Name, Head of Household Location, Country Person Individual for whom I record a phone number, email or mailing address Tom Hepworth First Name, Last Name Address Location at which a particular organization or person may be found or reached 2121 E. Haverford St. ). Here’s my sketch of the entities and relationships. Figure 3-4: Logical Data Model—Phone, Email and Mailing List I decided that, in addition to the country where a Household is located, I want to have a household name and head of household for each household.
