postgresql | Robust PostgreSQL interface for Swift | Web Framework library
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QUESTION
Is there a way in PostgreSQL to take this table:
ID country name values 1 USA John Smith {1,2,3} 2 USA Jane Smith {0,1,3} 3 USA Jane Doe {1,1,1} 4 USA John Doe {0,2,4}and generate this table from it with the column agg_values
:
Where each row aggregates all values
except from the current row and its peers.
So if name = John Smith
then agg_values = aggregate of all values where name not = John Smith
. Is that possible?
ANSWER
Answered 2021-Jun-14 at 20:16You can use a lateral join to a derived table that unnests all rows where the name is not equal and then aggregates that back into an array:
QUESTION
I have a basic model:
...ANSWER
Answered 2021-Jun-15 at 16:27You can use a CASE / WHEN
construction.
https://docs.djangoproject.com/en/3.2/ref/models/conditional-expressions/
QUESTION
I am creating a stored procedure in PostgreSQL 9.6 but I am getting syntax error. I am new to PostgreSQL. Are there more syntax errors in my code?
...ANSWER
Answered 2021-Jun-15 at 15:25Declare your function like this
QUESTION
How to escape single quote in an column alias in PostgreSQL?
I tried several syntaxes without success:
...ANSWER
Answered 2021-Jun-15 at 14:26Use double quote for the identifier, and one single quote inside:
QUESTION
I made a node JS application using Hapi on Windows 10. After testing it locally, the script start
would run without any problem. here is the start script inside the package.json
ANSWER
Answered 2021-Jun-15 at 10:13You need to quote the *
: nodemon -e "*" src/server.js
.
Unlike Windows' cmd, Linux shells expand wildcards (as you can see in the command actually run, above the error). In Windows it's up to the program you are calling to expand wildcards. Since that is what you want in case of nodemon, it worked "by chance" on Windows without escaping the asterisk because it doesn't have any special meaning to cmd, but in Linux it will get expanded and that's not what you want.
QUESTION
I have old django project and new django project. I created dump file from database of old django. And also I made changes in tables and created new tables.
Now I want to load that dump file to my new django app. I am facing errors when I firstly migrate then restore data or firstly restore then migrate.. When I do migration first, it says tables already exist.
When I do restore first , it says django.db.utils.ProgrammingError: relation "django_content_type" already exists
I use migrate --fake
error goes but new tables are not created in database.
I spent 3-4 days but could not succeed.
Please, help me if you can.
PS: my database is postgresql
...ANSWER
Answered 2021-Jun-15 at 07:00This is not straightforward and will need some manual interventions and it depends on what do you want to do in the future
If the tables that already exist in the database have a stable design and won't be changed or you can do the changes manually using SQL statements then set
managed = False
to the models' meta, this will make Django skip making migrations for those modelsIf you want to keep the power of migration in the new project for all models then this will more complex
- Delete all your migrations
- You need to make your models equivalent to your database, you can set
managed=False
for new models likeUsers
- Run
python manage.py makemigrations
, this will create the structure of the initial database. - Fake running the migrations
python manage.py migrate --fake
- Dump the records of django_migrations table
- Create a new empty migration (with --empty) and add the SQL statements of the
django_migrations
table to it usingmigrations.RunSQL()
- now fake again so you skip that new migration.
- Now you are ready to use migrations as usual.
When installing new database, you will just need to run python manage.py migrate
QUESTION
I'm new to Django. I've defined 2 tables and have set a foreign key. So I want to link the column note from table Comment to the column id from table Note.
As I'm using PostgreSQL, when I check the psql shell, the name of the column note will be displayed as note_id.
So for using in template, if I use something like comment.note
, it prints the "quick_note" of the note table, which I don't want that. I want to get the "id" of the related post to the current comment, not the quick_note of the related post. But if I use something like comments.note_id
, it shows the id of the related post, which is what I expect to get.
Also in the admin panel, I see a field of note: that shows related quick_note not id. How can I fix it that admin panel show the related id? So here I want the id of related post to be shown in front of note:.
This is my model.py:
...ANSWER
Answered 2021-Jun-15 at 06:31This is the behavior of Django, the foreignKey field points to an object while field_id maps to primary key of the object, this important in case of assignment as if you try to save
QUESTION
I have been facing a problem recently regarding JSONB data type in my Postgresql DB.
I have a rather complex structure of my column (let's say the table is called RATING and the column name FOOD_VALUE - making it up) which goes, for example, as follows:
...ANSWER
Answered 2021-Jun-15 at 06:29create type t_json_val as (path text[], val jsonb);
create or replace function jsonb_mset(a jsonb, variadic b t_json_val[])
returns jsonb
immutable
language plpgsql
as $$
-- Set multiple jsonb values at once
declare
bb t_json_val;
begin
foreach bb in array b loop
a := jsonb_set(a, bb.path, bb.val);
end loop;
return a;
end $$;
QUESTION
I'm trying to learn Flask and use postgresql with it. I'm following this tutorial https://realpython.com/flask-by-example-part-2-postgres-sqlalchemy-and-alembic/, but I keep getting error.
...ANSWER
Answered 2021-Jun-15 at 02:32I made a new file database.py and defined db there.
database.py
QUESTION
I need to activate the pre-ping feature for as SQLAlchemy db pool in Django Python.
ErrorWhen I set the pre_ping
property to True
, I get the following error which says I need to pass a dialect
to the connection pool when using the pre-ping feature:
ANSWER
Answered 2021-Mar-18 at 12:21Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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