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76 | Creating databases
9. Determine the relationships between the tables. In your plan, draw a line
from each match field in a table to the corresponding match field in the
related table.
What establishes a relationship between tables is that their match fields
contain matching data.
Relationships also make it possible to group your data to resolve complex
queries. For example, relationships can be used to determine current
inventory levels, sales projections, and other tasks where it is necessary to
query data across multiple tables. For more information about
relationships, see
chapter 4, “Working with related tables and files.
10. Determine whether you need to share your database with other users, and
how they will access the file.
For more information about sharing databases, see “Sharing databases on a
network” on page 156.
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 76 Μονδαψ, Αυγυστ 25, 2008 3:59 ΠΜ