Questions tagged [sqlalchemy]

Use this tag for the eponymous Python SQL toolkit and Object Relational Mapper.

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Unable to convert a table to hypertable due to unique index error

I am creating a table using Flask SQL Alchemy as follows: class Price(db.Model): __tablename__ = "prices" id = db.Column(db.Integer, primary_key=True) country_code = db.Column(db.String(2)...
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1answer
45 views

Storing many pandas DataFrames in SQLite with metadata

I need some help with designing a database. My aim is to persistently store a number of pandas DataFrames in a searchable way, and from what I've read SQLite is perfect for this task. Each DataFrame ...
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1answer
32 views

Generated DDL doesn't match with CREATE TABLE statement

I'm using MySQL with InnoDB engine. I create a new table that contains a foreign key, eg: CREATE TABLE rooms ( id INTEGER NOT NULL AUTO_INCREMENT, my_id VARCHAR(15), house_id INTEGER, ...
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1answer
42 views

Ram consumed by single query in Postgres using SqlAlchemy

I have a list of 36 queries ranging from low complexity(No joins) to high complexity(joins with subquery). I want to find the RAM Consumed by each query. This is required for performance testing for ...
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1answer
887 views

How to Bulk Insert sqlalchemy subclasses

I am trying to bulk insert SQL-Alchemy Subclasses into the parent table and their respective tables ie fruits tables -> Apple Table and so I insert a table of APPLE and it will insert both the row ...
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2answers
38 views

Database design question: Tags with values(duration) linked to them

I am creating a database that takes in daily inputs such as: Date Events in that date (e.g. project foo: 5 hours, bar: 2 hours, etc...) Rating of the date There's more but these are probably the ...
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1answer
2k views

convert SQL query to SQLAlchemy query [closed]

I am having a lot of trouble in converting the below SQL query to SQLAlchemy query. Please help: insert into conform_layer (unique_no,key_name,value_name) SELECT id, key, value FROM (select ...
2
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1answer
8k views

How to set a auto-increment value in SQLAlchemy?

This is my code : class csvimportt(Base): __tablename__ = 'csvimportt' #id = Column(INTEGER, primary_key=True, autoincrement=True) aid = Column(INTEGER(unsigned=True, zerofill=...
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0answers
54 views

How to “lock” a table for select

I have a table called assignments. A user will request an assignment from an API endpoint. I need to ensure that an assignment can only be handed to one user. There will be multiple users requesting ...
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1answer
1k views

Converting a date to a datetime in MySQL

I'm supposed to add time to a date field. We use MySQL with python3, alembic and sqlalchemy. Now I've written a conversion program. It is my first program of such a kind. I'm not certain how it will ...
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0answers
970 views

UUID default value on PSQL

I'm creating my database tables inside a flask application via SQLAlchemy. According to this answer, my code should look like this: id = db.Column(db.CHAR(36), primary_key=True, server_default=str("...
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1answer
3k views

Why are my queries taking so long? [closed]

In order to quickly calculate some features for later calculations I have attempted to store a table that allows looking up distances between locations that have been pre-calculated. I am using Python ...
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0answers
189 views

Multiple many-to-many database relations

SO told me to ask here, so this is just copy-pasted from over there We're making a database of anime. Every anime can be listed as having been made by an arbitrary number of studios, and every studio ...
2
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1answer
522 views

Database relationship inheritance [closed]

I have a vehicle sales store. In my store I sale many kind of vehicles for example cars and boats. And I would like to keep track of the sales. My vehicles has some attributes as: Arrive on store ...
3
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0answers
441 views

SELECT query blocking writes in postgresql

We have a web application that sends emails with a queue worker. Before an email is sent we write to a table: INSERT INTO user_email (user_id, email_key, sent_at) VALUES ( 175413579283955991, ...
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1answer
271 views

Use of MySQL trigger to insert row's week number

I have a table of orders in a MariaDB database that currently has a datetime column. For the dashboard I am building for this database, I have a statistic I would like to display which is "Orders This ...
4
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3answers
4k views

Performance of count(*) in subquery

Suppose we have the following queries: 1. SELECT COUNT(*) FROM some_big_table WHERE some_col = 'some_val' 2. SELECT COUNT(*) FROM ( SELECT * FROM some_big_table WHERE some_col = 'some_val' ...