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Planning a database | 75
8. For each table, decide which fields will store data, and which ones will be
used from other (related) tables.
Each table has only one subject, and all fields in a table describe only that
subject.
For example, the fields in one record of the Clients table together store all
the information about one client.
Based on a table’s subject, you can see where it makes sense to store the
data and where to use data from a related table. Other than match fields, all
fields should appear only once in your database. Cross out occurrences of
fields that don’t pertain to the table’s subject.
Client ID
Street
Postal Code
Client Name
City
Tour ID
Clients table
Routes table
Tour Name
Tours table
Phone
Route ID
Destination
Origin
Tour ID
Route ID
Destination
Tour Name
Origin
φμπ10_υσερσ_γυιδε.βοοκ Παγε 75 Μονδαψ, Αυγυστ 25, 2008 3:59 ΠΜ