databaseentity-relationshipeer-model
Can a relationship type attribute be a derived attribute?
Is it possible to have this? Assuming there are many attributes in the relations A and B
Solution
First we must remember that a derived attribute is a changing attribute that can be achieved by another, such as your age (current date - date of birth)
Yes, imagine this situation, you have the relationship of many to many students - course
We can say that a student will take a course that will start on January 3rd and last 8 weeks of effective classes, we can't put directly the attribute "end date" because this date could change (for example because of a strike, a pandemic) but we can put the start date and make the calculation.
- How can I migrate data from one PostgreSQL database to another (with slightly different table/column names)?
- how to enter the data only if all instructions are correct in my migration files?
- What is the most suitable data type for a column in a table?
- database primary key
- Is there a "with conn.cursor() as..." way to work with Sqlite?
- python + json file saving
- how can i scrape data efficiently and clean it
- Flask SQLAlchemy: flask db init not working (Error: No such command 'db'.)
- "Unsupported OP_QUERY command: insert" in Elixir project when trying to insert into Mongo DB
- Using Rails, how can I set my primary key to not be an integer-typed column?
- How can I add machines to data already been sharded in SQL database?
- Error Establishing Database Connection with Wordpress in MAMP
- AWS Glue missing permissions
- how to save marital relationship in a database
- utf-8 vs latin1
- Firebase Firestore: Accessing Never-Retrieved Data Offline
- How to configure postgresql for the first time?
- How to import .db file to pgAdmin 4?
- Map string column in Entity Framework to Enum (EF 6, not EF Core)
- Oracle Scheduler Job Failing
- Creating initial SQLiteDatabase when app is installed
- How to put a comment into HQL (Hibernate Query Language)?
- Unable to install SQL Server(setup.exe) Exit code decimal: -2061893606
- Use Hibernate to save objects to the database
- MySQL database connection error: ManagedConnectionFactory is null
- Check for existing data before writing to database
- BigQuery - Transaction is aborted due to concurrent update against table
- php scrape to write to mysql database error
- naming suggestions for database timestamp field
- In immudb, can we know if a certain key is available before we do the `Get` query?