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Django distinct values

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more . Get distinct values of Queryset by field. Ask Question Asked 9 years, 9 months ago. Active 2 years, 6 months ago. Viewed 66k times 49. 13. I've got this model: class Visit(models.Model): timestamp = models.DateTimeField(editable=False) ip_address = models.IPAddressField. QuerySet API reference¶. This document describes the details of the QuerySet API. It builds on the material presented in the model and database query guides, so you'll probably want to read and understand those documents before reading this one.. Throughout this reference we'll use the example Weblog models presented in the database query guide Django model distinct 的使用方法 作者:轻舞肥羊 日期:2014-06-11. 字体大小: 小 中 大. 今天突然有人问起在 django 的 model 里面怎么用 distinct, 对于这种东西,我一向的观点是查看django 的在线文档。于是不加思索的根据在线文档给出了答案,但结果很让人沮丧,运行程序时会报错: NotImplementedError: DISTINCT ON.

详细信息参见distinct() 中的备注。 如果values() 子句位于extra() 调用之后,extra() 中的select 参数定义的字段必须显式包含在values() 调用中。values() 调用后面的extra() 调用将忽略选择的额外的字段。 在values() 之后调用only() 和defer() 不太合理,所以将引发一个NotImplementedError。 New in Django 1.7: 新增最后一点. Home » Django » Get distinct values of Queryset by field. Get distinct values of Queryset by field . Posted by: admin December 2, 2017 Leave a comment. Questions: I've got this model: class Visit(models.Model): timestamp = models.DateTimeField(editable=False) ip_address = models.IPAddressField(editable=False) If a user visits multiple times in one day, how can I filter for unique rows. djangoのquerysetでuniqueな値を取得する方法のメモ書き. 1.4系以降ではdistinctの引数でfield名を指定できるようになっているらしい. ただしposgresql以外だとNotImplementedError('DISTINCT ON fields is not supported by this database backend')が出る Aggregation¶. The topic guide on Django's database-abstraction API described the way that you can use Django queries that create, retrieve, update and delete individual objects. However, sometimes you will need to retrieve values that are derived by summarizing or aggregating a collection of objects. This topic guide describes the ways that aggregate values can be generated and returned.

8. How to filter a queryset with criteria based on comparing their field values; 9. How to filter FileField without any file? 10. How to perform join operations in django ORM? 11. How to find second largest record using Django ORM ? 12. Find rows which have duplicate field values; 13. How to find distinct field values from queryset? 14 The distinct argument determines whether or not the aggregate function should be invoked for each distinct value of expressions (or set of values, for multiple expressions). The argument is only supported on aggregates that have allow_distinct set to True. The filter argument takes a Q object that's used to filter the rows that are aggregated. See Conditional aggregation and Filtering on. 如果想用distinct的话,在distinct前面加上values或values_list u.comment_set.values(forum).distinct() [{'forum': 1L}, {'forum': 2L}] u.comment_set.values_list(forum, flat=True).distinct() [1L, 2L] 其实就相当于values_list获得了一个数组然后set() 展开阅读全文 点赞; 评论 2; 分享. x. 海报分享 扫一扫,分享海报 收藏 1 ; 手机看 分享到微.

An optional boolean argument that determines if array values will be distinct. Defaults to False. django.contrib.postgres. PostgreSQL specific aggregation functions; Getting help FAQ Try the FAQ — it's got answers to many common questions. Index, Module Index, or Table of Contents Handy when looking for specific information. django-users mailing list Search for information in the. Django查询集去重 使用.distinct() 得到结果 使用|或运算符 用户和权限多对多管理 用户和组多对多关系 组和权限多对多管理 要得到用户的权限,需要得到自己的权.. 在django models中取得... qq_27361945:Note Any fields used in an order_by() call are included in the SQL SELECT columns.This can sometimes lead to unexpected results when used in conjunction with distinct(). If you order by fields from a related model, those fields will be added to the selected columns and they may make otherwise duplicate rows appear to be distinct

django models的values() 与 distinct()同时使用时,两者不分先后顺序 05-09 6389 django 中 当model设置了ordering后, 使用 distinct ()和annotate()问题记 Count number of distinct records by date in Django. Tag: django,django-queryset. following this question: Count number of records by date in Django. class Review(models.Model): venue = models.ForeignKey(Venue, db_index=True) review = models.TextField() datetime_visited = models.DateTimeField(default=datetime.now) It is true that the following line solves the problem of count number of records. 在django models中取得一个字段的distinct值。就是select distinct xxx from table_name这样的功能。使用values会生成ValuesQuerySet(形如N个dict组成的list),猜测大数据无额外性能影响,毕竟queryset系列都是使用时才查询操作的。 xxxx.objects.values(field_name).distinct() #或

django - Get distinct values of Queryset by field - Stack

Django, API, REST, Serializer fields. Boolean fields BooleanField. A boolean representation. When using HTML encoded form input be aware that omitting a value will always be treated as setting a field to False, even if it has a default=True option specified. This is because HTML checkbox inputs represent the unchecked state by omitting the value, so REST framework treats omission as if it is. 具体错误提示是: django.db.utils.NotSupportedError: DISTINCT ON fields is not supported by this database backend 刚好遇到mysql数据库查重,使用distinct方法来做去重查询,结果遇到这个错误。先看一下distinct的源码

django ORM之 values django里的这个distinct()函数也是这个功能,通常的用法是我们要取出一张表中的某一列的所有值,并且只取出不重复的,如果有重复的就只取出来一次,网络上几乎所有的对这个函数的使用例子对应的Python代码都如下:但是这样的用法往往. SQLite considers NULL values as duplicates. If you use theDISTINCT clause with a column that has NULL values, SQLite will keep one row of a NULL value. In database theory, if a column contains NULL values, it means that we do not have the information about that column of particular records or the information is not applicable Given a list, print all the unique numbers in any order. Examples: Input : 10 20 10 30 40 40 Output : 10 20 30 40 Input : 1 2 1 1 3 4 3 3 5 Output : 1 2 3 4 django - not - Get distinct values of Queryset by field . django queryset not in (2) I've got this model: class Visit(models.Model): timestamp = models.DateTimeField(editable=False) ip_address = models.IPAddressField(editable=False) If a user visits multiple times in one day, how can I filter for unique rows based on the ip. Following code will attach a new function named distinct to the Global Array object. If you are trying get distinct values of an array of objects, you can pass the name of the value to get the distinct values of that type

How we cut a heavy admin dashboard response time in half with advanced SQL and some Django hackery. I recently had the pleasure of optimizing an old dashboard. The solution we came up with required some advanced SQL that Django does not support out of the box. In this article I present the solution, how we got to it, and a word of caution Django Model - Get distinct value list. 87. November 22, 2019, at 00:00 AM. I try to get a list of distinct foreign keys and I wrote this: my_ids = Entity.objects.values('foreign_key').distinct() But I get just a list of UNDISTINCT foreign keys... What am I missing? Thanks! Answer 1. Thats for the hint! Both solutions wont work 100%... but I kind of combined them :) Passing an argument to.

The patch included modifies django/db/models/query.py so that the distinct method of the QuerySet object optionally takes variable number of field names and, if given, modifies the SQL statements generated so that 'DISTINCT ON (field,...)' is used 15:54. Extra columns when doing .distinct() in a Django QuerySet 22 December 2010. tl;dr: If you are doing a .distinct() query and limiting the results using .values() or .values_list(), you may be in for a surprise if your model has a default ordering using the Meta value ordering.You probably want to clear the ordering using .order_by() with no parameters

Django でorder_byすると指定したフィールドは SELECT される. SELECT に含まれるのはしょうがないので、order_by や values/only/distinct などと組み合わせる場合は結果の一意性を損なう可能性があるので気をつけなければならない。 この辺の話は、下記参考URLのDjangoのドキュメントに注意点として記載され. 2. 注意事项. 当同时使用distinct()和values(),需要注意order_by() (或者默认 model ordering) ,会自动加入select 中作为distinct项,所以返回的结果你以为是重复的,其实是order by的字段没列出来 Filtering QuerySets dynamically is a fairly common use case. Sure thing there is a pluggable app to make your life easier. This tutorial is about how to use the django-filter app to add a hassle-free filtering to your views. To illustrate this tutorial I will implement a view to search for users

Understand Group by in Django with SQL Django QuerySets and SQL side by side . Aggregation is a source of confusion in any type of ORM and Django is no different. The documentation provides a variety of examples and cheat-sheets that demonstrate how to group and aggregate data using the ORM, but I decided to approach this from a different angle. In this article I put QuerySets and SQL side by. How to Create Group By Queries With Django ORM. Dec 6, 2016 9 minutes read comments; views The values you generate on the database, using the annotate clause, can also be used to filter data. Usually in the database we use the HAVING function, which makes it very idiomatic. You can read the query like it was plain English. Now, in the Django side, it's a simple filter. For example, let. Select DISTINCT individual columns in django? (3) It's quite simple actually if The above example will work but all combinations of distinct() and values() may not. PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below: class ProductOrder(models.Model): product = models.CharField(max_length=20, primary_key=True.

python - How to use distinct() method without applying

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  1. 当 values() 与 distinct() 一起使用时,注意排序可能影响最终的结果。 详细信息参见 distinct() 中的备注。 如果 values() 子句位于 extra() 调用之后, extra() 中的 select 参数定义的字段必须显式包含在 values() 调用中。 values() 调用后面的 extra() 调用将忽略选择的额外的字段。 在 values() 之后调用 only() 和 defer.
  2. MySQL DISTINCT and NULL values. If a column has NULL values and you use the DISTINCT clause for that column, MySQL keeps only one NULL value because DISTINCT treats all NULL values as the same value. For example, in the customers table, we have many rows whose state column has NULL values. When you use the DISTINCT clause to query the customers' states, you will see unique states and NULL as.
  3. Django. The web framework for perfectionists with deadlines. Overview; Download; Documentation; News; Community; Code ; Issues; About ♥ Donate; Issues. GitHub Login; DjangoProject Login; Preferences; API; View Tickets; Reports; Timeline; Wiki; Search; Context Navigation. Back to Ticket #2939; Ticket #2939: distinct-values-count-v4.patch. File distinct-values-count-v4.patch, 3.4 KB (added by.
  4. der_csv_url.
  5. How to Make a Database Table Field Unique in Django. In this article, we show how to make a database table unique in Django. What this means is for a given field in a database table, only one row can have a specific value. If, for example, if we create a database table of Books and make the title field unique, there cannot be the same title anywhere in the database. Each title has to be unique.
  6. Python dictionary method values() returns a list of all the values available in a given dictionary. Syntax. Following is the syntax for values() method − dict.values() Parameters. NA. Return Value. This method returns a list of all the values available in a given dictionary. Example. The following example shows the usage of values() method
  7. ProductOrder.objects.order_by('category').values_list('category', flat=True).distinct() 他の答えはうまくいきますが、これはちょっとだけはっきりしています.Djangoの厄介なことなしにDISTINCTクエリから得られるような値を与えるだけです

File django-distinct-values-count.diff, 1.6 KB (added by andrew@, 13 years ago) patch to add count method to ValuesQuerySet, better handling distinct case django/db/models/query.p 6. How to select some fields only in a queryset?¶ The auth_user model has a number of fields in it. But sometimes, you do not need to use all the fields. In such situations, we can query only desired fields. Django provides two ways to do this. values and values_list methods on queryset. only_metho Getting Distinct Values from List in a JSONField → Allow querying for distinct values in JSONField lists: I'm not sure if it's feasible. Do you know if the query can be expressed in SQL? comment:2 follow-up: 3 Changed 2 years ago by Tim Graham. Triage Stage: Unreviewed → Accepted: Accepting for investigation if someone is interested, although I'm not sure what change or if a change should. Accessing dict values via a value of a variable as hash → Accessing dict values via a value of a variable as key This is essentially the same thing as #1495 , and the lookup filter from #577 I don't know what your exact use case for this is, but it doesn't really fit with the ethos of Django's templating language

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Count unique distinct values within same week, month or year. Author: Oscar Cronquist Article last updated on December 20, 2018 . The array formula in cell E3 counts unique distinct items for all dates within the same week. Example, week 2 has two unique distinct items: 1150 and 1131. Unique distinct values are all values but duplicates are merged into one value. Formula in B3: =WEEKNUM(C3. annotate with query set for distinct values Showing 1-7 of 7 messages. annotate with query set for distinct values: Slafs: 6/10/10 2:01 PM: Hi there! I have a question. If i have a model with some fields (let's say all CharFields named aaa,bbb,ccc etc. and some calculated properties named xxx and zzz) how can I obtain something similar to SELECT aaa, count(aaa) FROM my_model_table GROUP BY. django values 与values_list. Article.objects.values_list('comment_id', flat=True).distinct() vs Article.objects.values('comment_id').distinct() 有什么区别? 该values()方法返回包含字典的QuerySet: <QuerySet [{'comment_id': 1}, {'comment_id': 2}]> 该values_list()方法返回一个包含元组的QuerySet: <QuerySet [(1,), (2,)]> 如果您使用values_list()单个字段,则. The following are code examples for showing how to use django.db.models.OuterRef().They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like How to select distinct for one column and any in another column? Ask Question Asked 7 years, 8 months ago. Active 3 months ago. Viewed 204k times 32. 6. I need to query an SQL database to find all distinct values of one column and I need an arbitrary value from another column. For example, consider the following table with two columns, key and value: key value === ===== one test one another.

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Django Model-Get distinct value list (3) . I try to get a list of distinct foreign keys and I wrote this: my_ids = Entity.objects.values('foreign_key').distinct( Python List count()方法 Python 列表 描述 count() 方法用于统计某个元素在列表中出现的次数。 语法 count()方法语法: list.count(obj) 参数 obj -- 列表中统计的对象。 返回值 返回元素在列表中出现的次数。 实例 以下实例展示了 count()函数的使用方法: #!/usr/bin/python aList = [123, 'xyz',. The writings of Haki Benita. Haki Benita. About; Subscribe; 06 May 2020; Python, Django, ORM; How to Move a Django Model to Another App. In my latest article for RealPython I cover some exotic migration operations, many of the built-in migration CLI commands and demonstrate important migrations concepts such as reversible migrations, migration plans and introspection. 01 May 2020; Python. django 에서 bulk insert (0) 2018.04.02: django fliter 에다 list 넣기 (0) 2018.03.29: django query filter, value, distinct (0) 2018.03.28: django query (0) 2018.03.28 [django] ajax 사용해서 화면 수정 (2) 2018.03.19: django paginator 페이지 수 제한하기 (0) 2018.02.2 Re: [Django] #28560: distinct() on ordered queryset with restricted list of columns returns incorrect result (was: distinct() on None values) Django 9/2/17 11:40 A

CODE Q&A Solved. Tags; value - django queryset count distinct . How to sort by annotated Count() in a related model in Django (2) I am having a very similar issue. Basically, I know that the SQL query you want is: SELECT food.*, COUNT (IF (consumption. user_id = 123, TRUE, NULL)) AS. API Guide DjangoFilterBackend. The django-filter library includes a DjangoFilterBackend class which supports highly customizable field filtering for REST framework.. To use DjangoFilterBackend, first install django-filter.Then add django_filters to Django's INSTALLED_APPS. pip install django-filter You should now either add the filter backend to your settings Some fields we listed above are unique and the others have many distinct values - Showing choices is not an option. Bridging the gap between Django and the use 【Django】Django 如何实现 如下 联表 JOIN 查询? SQL语句: select distinct a.device_hash, sum(b.cmn_merge_count) from ( select distinct device_hash from tbl_fileprotect_svc_instance where customer_id= ' 3f500ac5-020d-3ce3-a2a2-51a59ddd606e ' ) as a left join tbl_file_protect_alarm as b on a.device_hash = b.device_hash group by a.device_hash

Select DISTINCT individual columns in django? Posted by: admin November 30, 2017 Leave a comment. Questions: I The above example will work but all combinations of distinct() and values() may not. PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below: class ProductOrder(models.Model): product = models.CharField Avoid doing that. Otherwise, you will end up having two possible values for no data, that is: None and an empty string. Having two possible values for no data is redundant. The Django convention is to use the empty string, not NULL. So, if you want a string-based model field to be nullable, prefer doing that: class Person (models Python | Get Unique values from list of dictionary. Sometimes, while working with Python dictionaries, we can have a problem in which we need to find the unique values over all the dictionaries in a list. This kind of utility can occur in case while working with similar data and we wish to extract the unique ones. Let's discuss certain ways in which this task can be performed. Method #1. Django Community 4234 packages and projects. Django community: Django Q&A RSS This page, updated regularly, aggregates Django Q&A from the Django community. Post Multiple Row and return in 1 ID (DJango) Posted on September 26, 2019 at 9:13 AM by Stack Overflow RSS. How to post multiple Row in HTML in 1 Day What I've done is the last row in table will the one will post to DB.Pos Read this post. For consolidating as array you can refer your earlier question Django Query distinct values works but i cant use the query result. Rohan. Popular Answer . names = Staff.objects.order_by('person__full_name').values('person__full_name').distinct() will give you distinct full names, and you can do a similar thing to get distinct job categories..

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Get distinct values of Queryset by field - ExceptionsHu

ProductOrder.objects.order_by('category').values_list('category', flat=True).distinct() Die anderen Antworten sind in Ordnung, aber das ist ein bisschen sauberer, da es nur die Werte gibt, die man von einer DISTINCT-Abfrage erhält, ohne von Django zu quälen Questions: I'm struggling getting my head around the Django's ORM. What I want to do is get a list of distinct values within a field on my table . the equivalent of one of the following: SELECT DISTINCT myfieldname FROM mytable (or alternatively) SELECT myfieldname FROM mytable GROUP BY myfieldname I'd at least like to. python django elasticsearch django-haystack searchqueryset this question edited Nov 18 '13 at 4:53 asked Nov 17 '13 at 18:49 Jeremy Blalock 1,130 6 14 Not sure the approach is right. What are you trying to accomplish and what does the data look like - James R Nov 18 '13 at 4:29 @JamesR I've added some information to the edit, would you mind taking a look django - values - Получите различные значения Queryset по полю . django related field queryset (2) У меня есть эта модель: # Hope it's something like this... values.distinct().count() Вы хотите: Visit.objects.filter(stuff).values(ip_address).annotate(n=models.Count(pk)) То, что это делает, это получить. I have a MySQL database unfortunately used with Django 1.4.1. Distinct function is only working for POSTGRESQL if i get it right. I have to make a distinct query consist of multiple values while only distinct one, Like; This one works for POSTGRE but not with MYSQL, I get the following error; DISTINCT ON fields is not supported by this database.

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Aggregation Django documentation Django

The following are code examples for showing how to use django.db.models.Sum(). They are from open source Python projects. You can vote up the examples you like or vote down the ones you don't like. Example 1. Project: cfbets Author: joshpelkey File: stats.py Apache License 2.0 : 6 votes def get_global_stats(): global_total_proposed = ProposedBet.objects.count() global_total_accepted. Distinct no va a aceptar ningún nombres de columna como argumentos. Govindan: lo siento, tienes razón. Parece que he parcheado Django para añadir esa característica. He añadido un enlace al parche; Esto es ahora en Django SVN y será en Django 1.

10. How to perform join operations in django ORM? 11. How to find second largest record using Django ORM ? 12. Find rows which have duplicate field values; 13. How to find distinct field values from queryset? 14. How to use Q objects for complex queries? 15. How to group records in Django ORM? 16. How to efficiently select a random object from. 8. How to filter a queryset with criteria based on comparing their field values¶. Django ORM makes it easy to filter based on fixed values. To get all User objects with first_name starting with 'R', you can do User.objects.filter(first_name__startswith='R').. What if you want to compare the first_name and last name values() と distinct() を組み合わせて使う場合、カラム値による 並べ替えが結果に思わぬ影響をもたらすことがあります。詳しくは distinct() の節を参照してください。 Django 1.0 で新たに登場しました. 以前は、 values() に渡せるのは blog だけで、 blog_id は使えませ んでした。 ValuesQuerySe Any way to speed up .distinct().count()? I have a bunch of queries that take a daily and monthly distinct count of a field in my database. I have heard that counts take a ton of time and computational power, in general, but I'm wondering if there are any tricks to speed up the process django的distinct obj=ClassName.objects.values('name').distinct() len(obj)=5 obj.count()=3 但是结果集中没有起到任何的过滤作用,此问题有待解决!!!!! 0 2010-04-28 17:07:09. 只看TA 引用 举报 #5 得分 0. 收藏帖子; 匿名用户不能发表回复! × New message. × New message.

django filter and distinct - Stack Overflow

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QuerySet.distinct and aggregates Showing 1-11 of 11 messages. QuerySet.distinct and aggregates: Wedg: 4/28/10 3:38 PM : I guess I'm writing this to confirm a behaviour and see if there might be a work around. It appears that qs.aggregate(Sum('field')) ignores qs.distinct(). If I have something like this: qs = Model.objects.filter(reverserelation__field=id).distinct() then len(qs) will. Community. Django Community 14258 people, 174 countries, 4222 packages and projects. Django .annotate(Count('id')).order_by().filter(id__count__gt=0) Here I would like to count distinct values for cities field on each element of the list of cities field.which should give the following final output. [{'london':2},{'newyork':1},{'chennai':1},{'mumbai':2}] Read this post in context. django. Y a-t-il une différence entre groupe par et DISTINCT Ajout dynamique d'une forme à un formset Django avec Ajax Comment obtenir l'adresse IP d'un utilisateur à django? Django: quand vous sauvegardez, Comment Pouvez-vous vérifier si un champ a changé? Django - quelle est la différence entre render(), rendre réponse() et directs (template) [Django] #30130: Django .values().distinct() returns a lot more records than .values().distinct().count() Showing 1-6 of 6 message

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SELECT DISTINCT FROM <model > (DMX) 06/07/2018; 3 minutes to read; In this article. APPLIES TO: SQL Server Analysis Services Azure Analysis Services Power BI Premium. Returns all possible states for the selected column in the model. The values that are returned vary depending on whether the specified column contains discrete values, discretized. python - value - django queryset count distinct . How to annotate Count with a condition in a Django queryset (2) For django >= 1.8 Use Conditional Aggregation : from django. db. models import Count, Case, When, IntegerField. Django评论:想删除用户URL,不扩展模型.如何? python - Django评论; 如何将2个Django QuerySets合并在一起,并进行SELECT DISTINCT; 在Django REST框架中的ModelViewSet中对不同的操作使用不同的身份验证; 实体框架 - 实体框架更新上的POCO SaveChanges()不起作用? Django线程评论和投 QuerySet API reference Django doesn't support that mode of access (slicing from the end), because it's not possible to do it efficiently in SQL. Also, note that reverse() should generally only be called on a QuerySet which has a defined ordering (e.g., when querying against a model which defines a default ordering, or when using order_by()). If no such ordering is defined for a given.

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Django Community 14202 people, 174 countries, 4215 packages and projects. Django community: Django Q I got a problem when I select the distinct value from DB. Here is my model => class Shift(models.Model): shiftid = models.CharField(max_length=15) shiftdesc = models.CharField(blank = False, null= False, max_length=20) dayname = models.CharField(blank = False, null= False, max_length=20. Let's discuss how to get unique values from a column in Pandas DataFrame.. Create a simple dataframe with dictionary of lists, say columns name are A, B, C, D, E.

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25 5월 2016 / Django (엑셀만큼 쉬운) Django Annotation/Aggregation. Django ORM을 강력하게 만들어주는 기능 중 하나는 바로 애너테이션(annotate)과 애그리게이션(aggregate)입니다.이 두 기능이 명쾌하게 와닿지 않아서 사용하지 못하다가, 엑셀에 빗대어 이해해보니 제게는 도움이 되어서 해당 내용을 공유합니다 It's cleaner to use set returning functions in the FROM clause where possible. The SQL standard does not allow them in the SELECT list. And it's almost always possible since we have LATERAL joins.. SELECT port, count(*) AS ct FROM tbl t, unnest(t.ports) AS port -- implicit LATERAL join GROUP BY port Так же, при использовании distinct() и values() вместе, будьте осторожны сортируя по полям не включенным в values(). Добавлено в Django 1.4. С Django 1.4, можно передать позиционные аргументы (*fields), указывая какие поля должны использоваться. The Web framework for perfectionists with deadlines. - django/django Django example of SELECT Distinct Count by values. GitHub Gist: instantly share code, notes, and snippets

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