Django group by multiple fields
WebDec 6, 2016 · Generally speaking, when you start doing group by queries, you are no longer interested in each model instances (or in a table row) details, but you want extract new information from your dataset, based on some common aspects shared between the model instances. Let’s have a look in an example: WebAug 9, 2016 · 1. You are trying to achieve this SQL: select *, count ('id') from menu_permission group by menu_id. But normally SQL requires that when a group by clause is used you only include those column names in the select that you are grouping by. This is not a django matter, but that's how SQL group by works.
Django group by multiple fields
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WebMar 10, 2010 · The GROUP BY clause is used in conjunction with the aggregate functions to group the result-set by one or more columns. e.g.: -- GROUP BY with one parameter: SELECT column_name, AGGREGATE_FUNCTION (column_name) FROM table_name WHERE column_name operator value GROUP BY column_name; -- GROUP BY with … WebJun 8, 2024 · 1 Answer Sorted by: 4 Yes, use F () expression with ExpressionWrapper. from django.db.models import F, ExpressionWrapper, FloatField qs = qs.annotate (conversion_rate=ExpressionWrapper (F ('client_count')/ F ('lead_count'), output_field=FloatField ())) Share Improve this answer Follow answered Jun 8, 2024 at …
Web1 In Django, Consider the following model class, class Report (models.Model): owner = models.ForeignKey ( to=Owner, on_delete=models.CASCADE, related_name='data', ) balance = models.PositiveIntegerField () report_date = models.DateField () Assume this table has only the following four items, WebJul 18, 2024 · 1 Answer. There is not a specific Django ORM way (as far as I know) but you can do the following to get a dictionary of entries grouped by the values of a field: Use .values_list () with flat=True to get a list of the existent values in your database (if you don't know them beforehand). Also, use .distinct () to eliminate duplicate values as we ...
WebOct 4, 2012 · I basically need to get a list of users ordered by company like this: Company A User 1 User 2 Company B User 3 user 4. I tried a few things, and the closest I could get to is: users = UserExtendedProfile.objects.values ('company', 'user').order_by ('company') However this would just give me results something like this: WebSep 23, 2024 · The new column can be added in the second argument assigned to a predefined or a user-defined function defined over a set of columns of data.table. The by argument can be added to group the data using a set of columns from the data table. The list() method can be used to specify a set of columns of the data.table to group the data …
WebNov 21, 2024 · Create a GROUP BY Query in Django Use Multiple Aggregations With the GROUP BY Query GROUP BY Records With Multiple Columns Filter Records From Every Group Most of you are …
WebJan 8, 2012 · 1 I'm using the regroup tag in a Django template to list a number of items, grouped by Customer. My model is: class Customer (models.Model): name = models.CharField (max_length=25) city = models.CharField (max_length=25) I can list the items customer.name (or customer.city), by what I really want is to order them as "Name, … black curly afroWebFeb 11, 2024 · To produce multiple aggregations of the same group, add multiple annotations: SELECT is_active, COUNT(id) AS total, MAX(date_joined) AS last_joined FROM auth_user GROUP BY … black curly arrowWebMay 6, 2024 · A GROUP BY in Django is used with the AGGREGATE functions or the built-ins. The GROUP BY statement and aggregate functions like COUNT, MAX, MIN, SUM, AVG are used in a combo to … black curly afro manWebJan 2, 2001 · Django distinct group by query on two fields Ask Question Asked 7 years, 6 months ago Modified 3 years, 2 months ago Viewed 16k times 15 I have a model which have 2 fields. class MyModel: tcode = Charfield created_on = Date field #some more fields now this model can have multiple rows with same tcode, and each row can have … blackcurl temperhorn mhwWebMar 25, 2024 · The problem essentially is due to the two very different ways that values is used in Django, depending on the context (whether or not values is followed by annotate) - which is (1) value extraction (SQL plain SELECT list) and (2) grouping + aggregation over the groups (SQL GROUP BY) - and in this case these two ways seem to conflict. gambiapropertyshop.comWebSep 5, 2009 · Django 1.1 does support aggregation methods like count. You can find the full documentation here. To answer your question, you can use something along the lines of: from django.db.models import Count q = Player.objects.annotate (Count ('games')) print q [0] print q [0].games__count. This will need slight tweaking depending on your actual model. gambia public procurement authority gppaWebWhen specifying the field to be aggregated in an aggregate function, Django will allow you to use the same double underscore notation that is used when referring to related fields in … black curly avatar