vat_rates | VAT rates for european countries
kandi X-RAY | vat_rates Summary
kandi X-RAY | vat_rates Summary
VAT rates for european countries based on the ec.europa.eu website
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QUESTION
I have two models, Product
model connects to ProductGroup
by ForeignKey
and a Product
model also has a ForeignKey
field named shop
:
ANSWER
Answered 2020-May-12 at 16:31Use distinct
on your query to eliminate duplicates
Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
By default, a QuerySet will not eliminate duplicate rows. In practice, this is rarely a problem, because simple queries such as Blog.objects.all() don’t introduce the possibility of duplicate result rows. However, if your query spans multiple tables, it’s possible to get duplicate results when a QuerySet is evaluated. That’s when you’d use distinct().
QUESTION
I need an upgrade from a problem already solved in another question: Retrieving the last record in each group - MySQL
My problem is very similar yet I cannot achieve the results I need.
In my first table VAT_types
I define what kind of rates are available by their names
ANSWER
Answered 2018-Nov-29 at 20:14It is common to find the greatest per group using the following approach
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