Keys in SQLAlchemy
Learn about keys and the keyword nullable in SQLAlchemy.
We'll cover the following...
Primary key
Let’s look at the following code:
id = Column(types.Integer, primary_key=True)
The id field indicates that it is the primary key. This means that no two records can have the same id in this table. In other words, the primary key must remain unique at all times. When a record is submitted, it overwrites the existing record with the same id, if any. The exception is when the id is not ...