Distinct on fields is not supported by this database backend I'm on SQLite locally, Postgres in production. encoding. Django : DISTINCT ON fields is not supported by this database backendTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"As promi Jan 5, 2022 · i'm trying to select all entries in a table with multiple columns where the combination of 3 specific columns are distinct using django ORM with MySql backend. request. validate_no_broken_transaction() with self. The code for the InMemory database is the following:. person print j,k Mar 18, 2015 · djangoのquerysetでuniqueな値を取得する方法のメモ書き．1. How do I select distinct columns of a,b,c,d,e,f,g,h and also have i,j in the result set. NotSupportedError('DISTINCT ON fields is not supported by this database backend') exception anyway Nov 1, 2019 · 具体错误提示是：django. This is not what we are looking for, especially if we want to implement drill-downs based on this query. Django docs distinct Jan 11, 2024 · Check database settings. Jan 28, 2014 · That's the model layout. admin LogEntry tables described below), but your code must be prepared to call django. Jan 4, 2022 · Django itself should mostly work smoothly with such columns (except for the contrib. user). I tried. values("ip_address"). Without changing databases, is there a way to get distinct values to show in a queryset? Thank you! Nov 22, 2022 · you can see that the proper parameter to pass in to distinct is a string, representing a field name. I know writing basic query using distinct as followed: var query = (from r in table1 orderby r. First, ensure you are using a database backend. With substring instead passed as a positional argument, it’ll be passed as a parameter in the database query. There might be differences in other backends. Here's the difference. first() print(res, type(res)) All groups and messages Getting distinct rows based on a certain field from a database in Django. 0. e. DISTINCT ON fields is not supported by this database backend. Just like other databases i have used DISTINCT or unique query set. If you don’t specify an order, you’ll get some arbitrary row. distinct(); but I need results where r. I don't have a clue why just saving wouldn't work. But I’m really confused with what you’re trying to do given that you’ve got a ManyToMany between Question and Category. ' ) self. save(update_fields=['status', 'tour_from']), etc) until you find the culprit. order_by("foreign_key_id") . distinct("post__user"). 4. Dec 28, 2023 · Databases such as MySQL or SQLite do not support this type of query. Jun 16, 2013 · I have a table column which some values are double or triple written. getlist('current_report'). Dec 28, 2023 · from django. Refe&hellip; From my understanding this feature is part of the SQL:2023 standard so adding support for it in UniqueConstraint even if it’s only supported by Postgres 15+ at the moment Nov 16, 2018 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. distinct() it comes through with two rows still. Dec 25, 2013 · WeatherReport. user_company ). Jun 2, 2016 · Which database backend do you use? Model. py file and run your migrations again. Consider changing for postgresql as the most supported for django backends. annotate(), here's a simple example: May 27, 2018 · This could be done by using a sqlite connection in the DATABASES section of pydotorg/settings/local. So by making the column you use in distinct as the first column in the order_by, I think it should work. but nothing seems to work. 3. fields. distinct in Linq to get result based on one field of the table (so do not require a whole duplicated records from table). values_list('ref')) This tells django that it shall contact your remote Database not your Local one. 'DISTINCT ON fields is not supported by this database backend'. For example Jan 11, 2024 · Check database settings. Instead, you can use group by along with an aggregation function. values_list('invoice_date'). using(self. It works though. py", line 172, in validate_autopk_value raise ValueError('The database backend does not accept 0 as a ' ValueError: The database backend does not accept 0 as a value for AutoField. You cannot limit it to just one column. Feb 18, 2022 · I have to mention that backend sqlite doesn't support distinct. annotate(last_stat=Max('StatsTwitter__Datetime')) Feb 25, 2016 · Share. Unable to get distinct results for queryset. Jun 19, 2023 · Hello there! I assume you are using MySQL here due to the backtip quoting of your identifiers? I’m not sure which version of MySQL you are running but when I try running your adjusted query on MySQL 8 I get this very explicit message CREATE TABLE app_transaction ( id int NOT NULL AUTO_INCREMENT, product_id int NOT NULL, PRIMARY KEY (id) ); SELECT DISTINCT product_id FROM app_transaction May 19, 2014 · select distinct applies to the ENTIRE row, not just a field. Select(Function(row) row. In the parent query, GROUP BY Person, and use separate Count() expressions for each category. distinct(). For a normal distinct() call, the database compares each field in each row when determining which rows are distinct. This to me seems wrong. order_by('-name_id'). Check database Setting. I need to get rid of this minor change but want to have it in the result set. values( 'timesheet_users' ). order_by(‘field_name1’) This works really well. cursor. Field(Of Int32)("Count")). pk) seen_ras. Release 15 Could Django support that clause? Oct 4, 2010 · One way to get the list of distinct column names from the database is to use distinct() in conjunction with values(). Count() only counts non-Null values, so use IIf() to return 1 for the category of interest and Null otherwise. """ - if fields: + if not fields: raise NotImplementedError('DISTINCT ON fields is not supported by this database backend') else: return 'DISTINCT' With this change in place, my code executes perfectly. Oct 8, 2013 · You just have to select the column and use Enumerable. The good thing with using Postgres is that you unlock a lot of special feature that Django have specifcly for Postgres. However, when I call the currentcheckedlist = request. When I try and do this I get: raise NotImplementedError('DISTINCT ON fields is not supported by this database backend') NotImplementedError: DISTINCT ON fields is not supported by this database backend Sep 13, 2012 · . Was there no way to write a method for a "select distinct [columnA], [columnB], … " statement for MySQL and other dbs that don’t support “distinct on”? But i'm getting "DISTINCT ON fields is not supported by this database backend", any thoughts? Python script return One line description of the issue so, i have repeated elements and i&#39;m trying to use distinct to filter then by one field. Apr 8, 2021 · I have a Model like below (Mysql). py Basically I want to query on TimesheetEntry model where there will be lot of entries of user which is a foreign key in User in-built model. `requestor_uname_id` = 2 ); Dec 16, 2021 · distinct('field_name') is not supported in MySQL. order_by('-id') You can't give arguments to distinct unless you are using Postgres. features. Here’s the difference. values('product_id'). Jun 16, 2014 · But still, the duplicate columns are coming in the result set, as i,j is differing with a minor change like result, result1, RESULT. Compare returned difference of fields with a variable in django queryset. NotSupportedError(). distinct("foreign_key_id") . JSONField as the documentation states. If you use the distinct keyword in HQL, then sometimes Hibernate will use the distinct SQL keyword, but in some situations it will use a result transformer to produce distinct results. For example this did not: tests = PhoneTests. PostgreSQL supports DISTINCT ON queries, the other backends do not. In your case you can do the following to get the names of distinct categories: q = ProductOrder. 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 fields is not supported by this database backend, 从字面上看，貌似是因为才用了mysql 的原因 Aug 11, 2022 · no, unless you somehow would "mock" it, but then likely the result of the test would depend more on how good the mocking is, and if you later change the view, then likely it will require even more work to fix the mocking properly. Jun 26, 2022 · Django Testing: DISTINCT ON fields is not supported by this database backend May 24, 2018 · This solves it on the current view. registrationAuthority if ra not in seen_ras: current. order_by('-updated_at'). AsEnumerable(). id first_name last_name n_children Nov 22, 2021 · Basically, you don’t mix annotations with groupings (as you’ve seen). What I'm trying to get is a list of everything in the boss field, but then omit the duplicates. The following are 30 code examples of django. models import Q portals = Portal. virtual void Sep 15, 2020 · I'm using sequelize and mysql2 and need to select all the distinct values from multiple columns. order_by('-updated_at'). """ import copy import result set. 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… Apr 30, 2021 · I was using the PostgreSQL only feature of distinct("col_1", "col_2") to weed out duplicate rows while also returning a few other non-distinct columns, say col_3 and Oct 16, 2019 · Magazine. Resolution: → invalid: Status: new → closed: Summary: Django `queryset` Cannot Call `distinct()` and `order_by()` On Separate Fields When Using Postgres SQL → Django queryset cannot call distinct() and order_by() on separate fields. Jun 19, 2023 · To make the long story short, we have a QuerySet of transactions of the same product_id, ordered by the primary key id. bosses = LootTable. DISTINCT ON fields is not supported by this database backend Nov 15, 2014 · Django's serializers. – Your problem is with this line. distinct() can't be used with sqlite3 so you will have to switch to something like postgres to use it or modify your query. From the docs: On PostgreSQL only, you can pass positional arguments (*fields) in order to specify the names of fields to which the DISTINCT should apply. If you are using postgres as a database, you are able to take full advantage of django. NotSupportedError: DISTINCT ON field Mar 10, 2022 · In some circumstances the revised deadline deviations code tried to add same deviation multiple times to DB, because get_submitters() might have returned multiple copies of the same user profile. Refe&hellip; @alanoe I recently submitted a PR to add support for it. filter( ~Q(customer_id=0), customer_id=customer_id, ). This provides the public API for the ORM. I've tried various different ways, . all() tests. objects. The main QuerySet implementation. public function setImageAttribute($value) { $attribute_name = "image"; $disk = "public_folder"; $destination_path Visit. Jan 18, 2019 · I am using distinct to get the distinct latest values but it is giving me an error: DISTINCT ON fields is not supported by this database backend views. – Oct 10, 2018 · How do I do that ? All I've tried so far has not worked. What's a way to re-write this query such that I get the same result? Note that I don't want to run a database query under a FOR loop - I've profiled that and the results are very unsavory. db. For example Feb 5, 2016 · try: states = qs. active_objects. SELECT DISTINCT foo, bar, baz should be read more as. filter(stuff). what you should do is add your fields of the model one by one (test. fields import JSONField. Drop and recreate the database; Temporarily disable atomic transactions. distinct() or values(). For DISTINCT ON queries the distinct method has now to be invoked as distinct(on_fields=<FIELD_LIST>), e. 2. 5. append(item) Apr 21, 2021 · Database query: distinct for one field. Apr 14, 2023 · Thanks for the info. But if you have millions of rows for each distinct value then you'll scan millions of rows just to return a single unique value. distinct(on_fields=('field1','field2')). supports_callproc_kwargs: raise NotSupportedError( 'Keyword parameters for callproc are not supported on this ' 'database backend. “For a normal distinct() call, the database compares each field in each row when determining which rows are distinct. distinct() for k in staff: j = k. append(s. serialize() expects Django model instances as inputs, and distinct() won't be returning that (even more so because cur_parent is not a ref to a model, but a CharField) If . values(‘field_name1’). Having said that, if you need a distinct on field query, you can implement it through the QuerySet API, using a combination of values(). amd64\lib\site-packages\django\db\backends\mysql\operations. If possible, you could remove any ordering colummns that are not in the distinct columns set and that would fix it. There is a minority opinion that says an Access database backend is perfectly stable and performant, provided that: Nov 4, 2008 · It's worth noting that the distinct keyword in HQL does not map directly to the distinct keyword in SQL. Mar 2, 2023 · SELECT DISTINCT ON is not supported The DISTINCT ON clause is a Postgres function which selects the first value for a group given the order by clause. Reload to refresh your session. If i try to add distinct to it, then I get 'list' object has no attribute 'distinct'. values('cur_parent') works for you, you can just serialize that list of distinct parents with a regular JSON serializer, e. distinct('data__mOfficerCode') It gives me the following error: NotSupportedError: DISTINCT ON fields is not supported by this database backend But it's because I'm using this new library, not the native django mysql backend. userprofile. 1 A 1 2 A 1 3 A 3 4 B 1 5 B 1 6 B 4 7 D 2 8 D 3 9 D 3 10 F 3 11 B 4 I want to get all the rows Jan 18, 2019 · I am using distinct to get the distinct latest values but it is giving me an error: DISTINCT ON fields is not supported by this database backend views. Sep 13, 2012 · . 1. distinct() Returns Apr 19, 2021 · I have table as Model name: Test id col1 col2 col3 col4 . It may not support the most recent releases of Django. If that's the case than this is the way to go: accounts_twitter = SocialMedia. distinct() print q. callproc(procname) elif Jun 19, 2021 · Get distinct values of Queryset by field. First you have to order objects by the field if you want to distinct. (). Using the following. for name in tests: res = Reports. values('model_code'). filter(name=name). If any fields are given, only the given fields are being 7: checked for duplicates. distinct etc. distinct('city') It seems that the DISTINCT ON expression(s) must match the leftmost ORDER BY expression(s). I want to have a distinct query. Jun 30, 2023 · Specifying NULLS NOT DISTINCT on unique indexes / constraints on Postgres 15+ will cause NULL to be treated as not distinct, or in other words, equivalently. filter(mag_no='A656MAF00001'). smart_unicode() at times if it really wants to work with consistent data – Django will not do this for you (the database backend Jan 18, 2019 · File "D:\software\WinPython-64bit-3. message) if e. I'd be put money on the single DISTINCT call being faster (I'd also check with whichever database backend you're using to see). The only way to do this shown in Gordon's example, this is the only valid example and answer. Can someone help me out, many About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety Press Copyright Contact us Creators Advertise Developers Terms Privacy Jun 23, 2014 · @S. Aug 26, 2011 · DISTINCT is indeed a cpu intensive query. postgres. Which system is not supporting DISTINCT ? Apr 9, 2022 · DISTINCT ON expression only applicable to PostgreSQL(I did not check in the Oracle database please let me know in the comment section). For example I've a 'Title' and a 'Location' column. append(ra) # We hit again May 14, 2015 · You signed in with another tab or window. all(). Aug 29, 2023 · So I’m told. `vehicle_no_id` FROM `API_fuelcardlog` WHERE ( `API_fuelcardlog` . just replace your current configuration with protesql’s in your settings. The above query would still get me rows which are unique for (col1,col2,col3) but not for (col1,col2) Problem with sqlite distinct is it distincts on all returned values. Multiple reference field: returned items do not contain the multiple reference field at all. distinct('registrationAuthority') except: # (NotImplementedError, e): print(e) print(e. annotate(), here's a simple example: raise NotImplementedError('DISTINCT ON fields is not supported by this database backend') NotImplementedError: DISTINCT ON fields is not supported by this database backend. distinct('name_id') since you call for distinct This translates to a SELECT DISTINCT ON SQL query. query""" The main QuerySet implementation. filter(item=item). You switched accounts on another tab or window. That’s what aggregation is for. It only support distinct() MySQL is fine when you want to test out, but most (if not all) database in production do not use Mysql but Postgres. And which version of Django? This looks like a bug. For some reasons, we have duplicated data on this Table. Here you defined the $disk as public_folder:. value_list, . py my problem is from this line Jan 18, 2019 · I am using distinct to get the distinct latest values but it is giving me an error: DISTINCT ON fields is not supported by this database backend views. order_by('city', '-date'). Typeorm takes the typing of a field and tries to create that database field based on the typing it reads. Jul 27, 2020 · NotSupportedError: DISTINCT ON fields is not supported by this database backend. models. However, so is COUNT(*) and your second query is going to first run an count aggregate with a group by and then run a COUNT on the results. 2. Nov 9, 2020 · I'm trying to get all unique values of a certain field of a Django model. Apr 16, 2014 · As explained in another answer, the distinct keyword applies to all the columns in the select statement. values, order_by. It is impossible to select all columns and make some distinct and some not. objects . I ended up deleting the migrations and that cleared the issue. I have uploaded a new patch which fixes the handling of multiple fields in a DISTINCT ON query as well as the count method for DISTINCT ON queries and resolves the qouting issues. 8 """ 9 - if fields: 10 + if not fields: 11: raise NotImplementedError('DISTINCT ON fields is not supported by this database backend') 12: else: 13: return 'DISTINCT' Feb 25, 2019 · OK it seems it was indeed migrations as @Willem Van Onsem suggested. Ali Django's feature support is still limited by the capabilities of the specific backend. values('field_name'). """ import copy import Apr 16, 2018 · And again: When you access the query, the count will only be correct if you select the anticipated (grouped) columns. Distinct: Dim distinctCounts As IEnumerable(Of Int32) = loadedData. Nov 10, 2022 · Not sure how your SozialMedia model looks like, but I assume you have one. count() But when I iterate over "Visit. Source code for django. Lemme know wether this helps or not. Not sure if PostgreSQL is really doing the right thing here (it could discard the spurious ordering statements itself), but it's irrelevant for our purposes; the patch causes a crash. The SQL DISTINCT keyword is used in conjunction with a SELECT statement to eliminate all the duplicate records and fetching only unique records. Text select r). qs_transactions = Transaction. text is not duplicated. distinct('name_id') must be . The Django adapter is available in versions 1. distinct() However, when retrieving the distinct product_id, the query set returns When querying a collection that contains a reference field without using the include() function: Single reference field: returned items contain only the ID of the referenced item, and not the full referenced items. I have included you the documentation and example. distinct()" I got much more items and some duplicates EDIT : The filter clause was causing me troubles. staff = Staff. From distinct documentation. 告诉我数据库不支持。 当然可以这样： items = [] for item in query_set: if item not in items: items. Adding support in third-party database backends¶ If you’re using a database backend that uses a different SQL syntax for a certain function, you can add support for it by monkey patching a new method onto the function’s class. py naming it for Instance "remote" and then modify your q2 as follows : qs2 = (Remote. For a distinct() call with specified field names, the database will only compare the specified field names. 2 with MySQL 8. My URI query looks something like this Dec 26, 2024 · Creates a spatial index for the database table with given schema and name (schema is ignored if not supported by the backend). I would seem that maintaining access to “distinct” queries by field would be ideal. This query will return all distinct values of word field in the collection. wrap_database_errors: if params is None and kparams is None: return self. Now distinct and grouping are not supported by EF core for the InMemory database. As part of configuring a given database secret backend, you define roles to include user creation and revocation statements, known as creation_statements and revocation_statements respectively in the query language native to the target database. distinct() try: states = qs. I was filtering with another table field and a SQL JOIN was made that was breaking the distinct Dec 1, 2016 · There is a prevailing opinion that regards Access as an unreliable backend database for concurrent use, especially for more than 20 concurrent users, due to the tendency of the database being corrupted. values('person'). Feb 1, 2015 · Installed 2019 version: Django backend for Microsoft SQL Server and Azure SQL Database using pyodbc, compatible with SQL Server 2019. DISTINCT ON fields is not supported by this database Dec 28, 2017 · When you select distinct values from your column you end up scanning all rows in the index: This can be a great strategy if there aren't many rows in the table or if the column doesn't have very many duplicate values. Jun 25, 2012 · All groups and messages Jul 22, 2021 · MyModel. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. order_by("post__created") But i gets an error:: DISTINCT ON fields is not supported by this database backend. in my note/models. This needs to be done just once for your MySQL server, not per database. distinct('Contrat_text') . user. distinct() works fine with PostgreSQL. Jul 10, 2023 · Specifying NULLS NOT DISTINCT on unique indexes / constraints on Postgres 15+ will cause NULL to be treated as not distinct, or in other words, equivalently. message == "DISTINCT ON fields is not supported by this database backend": current = [] seen_ras = [] for s in states: ra = s. e = TableName. By default, a QuerySet will not eliminate duplicate rows. SELECT DISTINCT(foo,bar,baz) and not: SELECT DISTINCT(foo), NON-DISTINCT(bar), NON-DISTINCT(baz) If you want a particular field to be unique within your query, then you should group on that field. py def cat_details(request, pk if kparams is not None and not self. Oct 25, 2015 · Problem is, I get a DISTINCT ON fields is not supported by this database backend. Unfortunately sqlite doesn't support DISTINCT on fields so the following didn't work. Distinct("word"); where collection - is an instance from your example. So since SQLite3 doesn't support DISTINCT ON fields, I don't think implementing this workaround is a good idea. In your case it will apply to all: colA, colB, colC, colD. Is there a way to make this work?, and what is the best solution? Jan 18, 2019 · DISTINCT ON fields is not supported by this database backend TimesheetEntry. py. filter( timesheet_jobs__job_company = self. Oct 4, 2012 · Use a subquery to select the distinct values from your table. _using). It might be worth pointing out the the mess was caused by switching from Django models to Django MTPP models and using 0 as a default value for the newly added MTPP fields to avoid another issue in that process. But you have to import the correct JSONfield by using django. NET): Nov 3, 2013 · MongoDB API has a distinct aggregation command, which returns distinct values found for a specified key in a collection. Until ef core 2. django 在线文档讲解 distinct 的连接如下： Django uses distinct to report DISTINCT ON fields is not supported by this database backend, Programmer Sought, the best programmer technical posts sharing site. Django implemented a function that translates to a DISTINCT ON query, but naturally it does not work with MySQL and other databases that do not support it. filter(product_id=fixed_value). append(ra) # We hit again Nov 1, 2020 · Typeorm casts the code below to a varchar field in my postgres database because I gave it a string as a type in typescript. sessions Session and contrib. distinct('shared_note') Basically, I need to get all OrderNotes items, distinct on shared_note. For example, SELECT DISTINCT ON (a) gives you the first row for each value in column a. At the moment Feb 24, 2020 · During testing I need to implement the view in the InMemory database. pip install django-pyodbc-azure-2019 System check identified no issues (0 silenced). append(item) Dec 28, 2017 · When you select distinct values from your column you end up scanning all rows in the index: This can be a great strategy if there aren't many rows in the table or if the column doesn't have very many duplicate values. References PostgreSQL: Feature Description PostgreSQL: Documentation: 15: E. NotSupportedError: difference is not supported on this database backend. distinct("community")) I got an error, raise NotSupportedError('DISTINCT ON fields is not supported by this database backend') django. using("remote"). You signed out in another tab or window. virtual QgsVectorLayer * createSqlVectorLayer (const SqlVectorLayerOptions &options) const Creates and returns a (possibly invalid) vector layer based on the sql statement and optional options. values('Category'). However I want the uniqueness to be on (col1,col2) pair. contrib. Dec 31, 2018 · Hence you can only use operations like icontains and contains for querying that field. This shouldn't affect production or other servers afaik (can you please confirm @berkerpeksag?) raise NotImplementedError('DISTINCT ON fields is not supported by this database backend') NotImplementedError: DISTINCT ON fields is not supported by this database backend. Jan 10, 2017 · Saved searches Use saved searches to filter your results more quickly The DISTINCT applies to all values you are selecting, not just to some columns. But distinct or group by isn't supported yet. Feb 24, 2023 · NotSupportedError("DISTINCT ON fields is not supported by this database backend")错误是由于您的Django应用程序试图使用DISTINCT ON字段，而您的数据库后端不支持这个功能。 DISTINCT ON是PostgreSQL数据库的特殊功能，它允许您在查询结果中去重，但只保留一个具有特定字段值的行。 Feb 15, 2019 · but that's not an answer, it's a workaround (or better, trying to figure out what's going on). X and later. NotSupportedError: DISTINCT ON field When I use database console to run mysql command. Time zone definitions¶ If you plan on using Django’s timezone support, use mysql_tzinfo_to_sql to load time zone tables into the MySQL database. Nov 14, 2017 · What you might want to do is defining a second Database in your settings. it's going to cause you more trouble down the line. Thank you for your time May 14, 2018 · I'm trying to create a query in Django that calls unique rows (using distinct) that meet some condition of a filter (using filter) here are the used files : views. The Vault Databases backend supports a number of popular databases for which it can create and revoke user credentials. So i figured out today a way to use DISTINCT with mysqlclient and mariadb backend. values('boss'). With no order by clause, it gives a random value! Dec 18, 2011 · While reading from A , I want to make sure that the rows are distinct based on few columns. For example when you are using an outer join like this: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jan 14, 2013 · I am trying to use . filter(). Distinct() In query syntax(i didn't know that even Distinct is supported directly in VB. . Django: SQL query with distinct on model function. A. Contrat = Contrat. Explore Teams Mar 18, 2010 · When you specify field names, you must provide an order_by() in the QuerySet, and the fields in order_by() must start with the fields in distinct(), in the same order. g. I recommend switching to a database like Postgres or Oracle, with a preference for Postgres. this was possible. I am using distinct to get the distinct latest values but it is giving me an error: DISTINCT ON fields is not supported by this database backend Jun 30, 2023 · By default, NULL values are treated as distinct entries. I tried to get distinct records based on Phone, but I couldn't make it done. 1. distinct('name') would have raised a. Django supports following databases officially: PostgreSQL; MySQL; SQLite; Oracle; Make sure the engine value in your DATABASES setting matches your database type. distinct(). py class ReportView(LoginRequiredMixin, g Dec 16, 2021 · distinct('field_name') is not supported in MySQL. Specifying NULLS NOT DISTINCT on unique indexes / constraints on Postgres 15+ will cause NULL to be treated as not distinct, or in other words, equivalently. query # See for yourself. 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。 Dec 28, 2023 · yes, very simple. @Column({ unique: true, nullable: true, }) resetPasswordToken!: string; This is also where lies my problem. utils. Side-note: This count distinct is not supported in CDS Views with the annotation May 8, 2015 · I want to get a list of distinct values from my OData endpoint. To distinct on one column name, for example: 'url' to get all unique urls from a table, but also get the rest of the data, use a subquery. SELECT DISTINCT `API_fuelcardlog` . Feb 24, 2023 · NotSupportedError("DISTINCT ON fields is not supported by this database backend")错误是由于您的Django应用程序试图使用DISTINCT ON字段，而您的数据库后端不支持这个功能。 DISTINCT ON是PostgreSQL数据库的特殊功能，它允许您在查询结果中去重，但只保留一个具有特定字段值的行。 Aug 23, 2019 · 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 fields is not supported by this database backend, 从字面上看，貌似是因为才用了mysql 的原因，其实不是. Jun 26, 2022 · Django Testing: DISTINCT ON fields is not supported by this database backend I have uploaded a new patch which fixes the handling of multiple fields in a DISTINCT ON query as well as the count method for DISTINCT ON queries and resolves the qouting issues. distinct([*fields]) only works in PostgresSQL. Django+MySQLで開発をしていたときのことです。 Querysetでdistinct('id’)など、distinctの関数を使用したら上記のエラーが表示されてしまいました。 Apr 7, 2022 · Now I need the full queryset not just the names, so that I can serialize the results and return the other fields too. That’s why you get the not supported error If any fields are given, only the given fields are being checked for duplicates. filter(user=request. I was able to solve it by creating the following new variable. distinct('name_id') I get DISTINCT ON fields is not supported by this database backend Im on Django 4. POST. Mar 26, 2013 · OrderNotes. dates = Invoices. You can also use it from C# Driver: var distinctWords = collection. order_by fields are always available in the select statement. order_by('Contrat_text'). This translates to a SELECT DISTINCT ON SQL query. “ So if item_id is treated as a field, then that alone makes each result “distinct”. distinct() May 9, 2023 · Bug description The issue occurs on MySQL setup, causing error 500 on Benchmarks tab, because DISTINCT ON fields is not supported by this database backend The bug is Query asked by user. 0. Django selecting distinct field not Jan 15, 2020 · How to fix DISTINCT ON fields is not supported by this database backend in django? this is my model. Also . so I have a query something like: select distinct col1, col2, col3 from A. 0Qt5\python-3. order_by('id') def function(qs_transactions) qs_product_id = qs_transactions. in_bulk(field_name="foreign_key_id") foreign_key_id is not unique on MyModel but given the use of distinct should be unique within the QuerySet. py Nov 19, 2014 · There are multiple columns in the select query, so the query will check for uniqueness across all the columns, not just the one in brackets. distinct('invoice_date') so I've tried this. Oct 17, 2020 · You are probably using sqlite as db backend which does not support distinct on fields The Query. Jun 18, 2021 · When I use DISTINCT, Community. yoamvv lti qkouw xrbzm zwxods ljx etpq rlnz jqqaz dlsj