For example, to retrieve all the entries where the author’s name is the same as the blog name, we could issue the query: statement, the percent sign signifies a multiple-character wildcard and the underscore signifies a single-character wildcard.) This means things should work intuitively, so the abstraction doesn’t leak.
For example, to retrieve all the entries that contain a percent sign, just use the percent sign as any other character: method is applied instantly and returns the number of rows matched by the query (which may not be equal to the number of rows updated if some rows already have the new value).
For example, a available, all objects in the iterable will be added without removing any existing elements.
But what if you want to compare the value of a model field with another field on the same model?
Django provides act as a reference to a model field within a query.
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.