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To span a relationship, just use the field name of related fields across models, separated by double underscores, until you get to the field you want.This example retrieves all If you are filtering across multiple relationships and one of the intermediate models doesn’t have a value that meets the filter condition, Django will treat it as if there is an empty (all values are In the examples given so far, we have constructed filters that compare the value of a model field with a constant.For example, to increment the pingback count for every entry in the blog: .

An example of simple Person entity that has many email addresses and phone numbers is shown on the following diagram: This simple but still highly normalized data model is optimized for large number of concurrent users who can update any of the tables in the diagram.

We can have one user who is updatingtable without affecting each other.

The LACCDB file contains no data and deletes itself when you close the database.

However, in some cases, this file does not delete itself, and the database continues to show as locked.

Furthermore, we can have several users that are updating different email addresses for the same user without affecting each other because locks are applied at the row-level.

As we can see this model is designed for high concurrent updates of the same logical records.

The only restriction on the to update one field based on the value of another field in the model.

This is especially useful for incrementing counters based upon their current value.

Since version 2007, the default Access file extension is ACCDB.

Locking files share the same name and location as the main database file, but their extension is LACCDB.

Every version of Microsoft Access uses a locking file that prevents users from working on the same record at the same time.

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