By Chris Moyer;Bob Bowers
With greater than seven million clients around the globe, FileMaker is without doubt one of the most well liked database applications out there. yet previously, there haven't been any books for FileMaker professional 5.5 builders that debate complicated subject matters. complex FileMaker seasoned 5.5 ideas for builders covers such subject matters as relational concept, protection implementations, audit trails, recursive relationships, complex use of portals, and reporting. FileMaker specialists Chris Moyer and Bob Bowers hide the basis talents, and extra, which are required for advanced FileMaker structures.
* learn the way the relational version is carried out in FileMaker seasoned.
* Use rollbacks to revive facts.
* safeguard your database opposed to unauthorized entry.
* construct a safe login method to manage person entry.
* become aware of the flexibleness and gear of portals.
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Extra info for Advanced FileMaker Pro 5.5 techniques for developers
Furthermore, no subset of this group of attributes can also be unique for every possible tuple of the relation. This last part is worth an example. 29 Chapter 1 The Relational Model Chapter 1 Given an invoice system (shown here with some friends): Invoice Invoice ID Invoice Date Customer Line Item Invoice ID Product ID Quantity Product Product ID Product Name Price Let’s say that the Invoice ID in the Invoice table and the Product ID in the Product table are both serial numbers, and are therefore unique in each record of their respective relations.
1 Result of a join: The invoice information on this layout comes from the Invoice table, while the customer information is from the Customer table. It’s easy enough to omit records with an empty Customer ID. Just enter Find mode, put an = sign in the Customer ID field, check the Omit box, and find. To also omit records that don’t have a valid Customer ID, you need to do one of two things: l Add the related Customer ID field (from the Customer file) to the layout that you’ll be using for the find.
A foreign key references the primary key in another database or, in terms of the relational model, in another relation. The foreign key must always reference a primary key that actually exists in the other relation. This is known as referential integrity. As you might guess, a foreign key that references a nonexistent primary key in another relation is meaningless. Therefore, enforcing referential integrity is tantamount to protecting meaning. Preserving referential integrity has implications when we consider updating and deleting records.