I use the pandas method to_sql to append a DataFrame to some sqlite table. The sqlite table has a foreign key constraints on a column id_region that p ...
I use the pandas method to_sql to append a DataFrame to some sqlite table. The sqlite table has a foreign key constraints on a column id_region that p ...
I've been having an issue with setting the ForeignKey in one of my model fields for the author variable. See below: As soon as I add "null=True" to ...
I am learning prisma and I can't figure out how to use the prisma types correctly if the returned data includes a sub model. For example, I have the ...
When you have two tables with a foreign key for example CREATE TABLE departments ( department_id INTEGER PRIMARY KEY AUTOINCREMENT, department_name ...
When reading the topics related to Django's select_related() and prefetch_related() on some websites including Stack Overflow, I frequently see the wo ...
I have a number of database tabels that are connected via manytomany and foreign key fields. I would like to query the database to output a Schedul ...
When I add a row that references another table (in a transaction), MySQL seems to lock the whole row that's being referenced. This prevents updates of ...
I have below two parent-(UserLogins,UserSecurityQuestions) and one child table - UserSecurityAnswers #Child Table #INsert value in to parent tab ...
I try to create relations between different tables in my database and get data from these tables, but I got an error: Property does not exist on this ...
Using PostgreSQL, I want to make an application that manages Daily Habits. I'm trying to make a one-to-many relationship from the User tables to Habit ...
I have already succeeded in adding one many-to-many relationship in my database. However, when trying to add another, I am met with: sqlalchemy.exc.N ...
Job file Customer.php Model Occasionally, I get the error below: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a c ...
On my site I've some ads. I'm trying to filter/search ads using a foreign key. On my ad I have some values, for example 'names' or 'city_id'. City_id ...
Using the example from PostgresSQL documentation, where orders.product_no references foreign key products.product_no. Consider the following updates o ...
I am trying to create relationships from the AspNetUsers table autogenerated by AspNet Identity to tables created by myself. Ex. Table A has a UserId ...
I have a model Run with two ForeignKeys, signup and report, pointing to models, which in turn are related to another model, Training, When creat ...
I run sql query in Navicat, so got error; Query: Error: How can I fix it? ...
Given the models "Animal" and "Person", where Animal BelongsTo Person and Person HasOne Animal, does this mean that every single Animal instance will ...
I want to create tables in a Postgres database using Python's SQLAlchemy package and insert data from a dataframe into them. I also want to assign for ...
i'm facing an annoing bug in Django and i don't know how i can solve it. I'm trying to show up names from one other table using INNER JOIN but isn't ...