By Andrew J. Mortimer
A concise advisor to information modelling for database layout, from first touch with the consumer association, via research and layout, to the ultimate end result - a potential set of knowledge tables able to be applied in a relational database administration procedure
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Extra resources for Information Structure Design for Databases. A Practical Guide to Data Modelling
A car has a colour and an engine capacity. A house has a number of rooms and a number (possibly zero) of garages. Orders and invoices have dates, customers and a sum of money. A sale has a salesman, a customer and a value. A salary increase has a person, a percentage increase value and a date. Evidentiy, these entities are of interest to some organisation or enteφrise because of the organisation's interest in recording the attributes. 37 INFORMATION STRUCTURE DESIGN FOR DATABASES The attributes of a thing can be thought of in the same way as the columns in a table where a line of the table relates to one occurrence of the entity.
And wife, the relationship is mandatory for both the entities, for the simple reason that a husband is not a husband and the wife is not a wife if the relationship does not exist. Another example of membership might be that of a commercial aircraft flight and a pilot. A pilot can exist without a night (the pilot may just have been entered onto the database and has not been on a flight yet) but a flight could surely not exist without a pilot. ) PILOT FUGHT Figure 4-7 Examples of Membership Marking The dot markers indicate that the flight cannot exist without a pilot, but that a pilot can exist without a flight.
A ΕΝ1Τ1Ύ Β LINK ENTITY A /B Figure 5-2 Many-To-Many resolved The Many-to-Many has been solved, and the Link entity AIΒ will now contain an entry for every case of A and Β relating. In Figure 5-3, the tables car and driver are shown, with a few of their many possible attributes. In the link table driven, the unique identifiers of both car and driver appear. In effect, this table records the instances of the relationship between car and driver — in this case, the period of time during which the driver was associated with the car.
Information Structure Design for Databases. A Practical Guide to Data Modelling by Andrew J. Mortimer