From Dwayne Wright PMP, PMI-ACP, CSM
Certified FileMaker Developer
Data tunneling is a term often referred to when a FileMaker table pulls data from another table, through a relationship that goes through one or more other tables. A join table is a classic example of data tunneling but there are tunnels that do not include a join table.
Here you can see four table occurrences in a row, this is a good example of a drilling possibility. From the far left table occurrence, I can see all the clients that have purchased the product (from the far right table occurrence). Thing is the primary key data doesn’t exist in the other table. So you cannot find an inventory field in the client table ... or ... a client field in the inventory table. The relationship match for the portals flows through the invoice and invoice line item tables.
From here, I can see the names of the customers that have purchased a product and you notice there are no duplicates (although many of these clients have purchased this product many times).
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© 2008 - Dwayne Wright - dwaynewright.com
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