With many-to-one relationships, a row from the first table can be connected to multiple rows in the second table, but each row in the second table relates to just one row from the first table. PostgreSQL enforces foreign key constraints to maintain database integrity.
When dealing with many-to-one relationships using Drizzle ORM, adding a foreign key involves creating migration files, where PostgreSQL ensures data consistency by preventing operations like deleting a user that's an author of an article or updating articles to point to a non-existent user.
By following proper migration steps with Drizzle ORM, such as creating migration files and running them, database schema changes like adding a non-nullable foreign key column can be implemented smoothly.
The article emphasizes the importance of managing relationships between tables, especially in the context of establishing many-to-one relationships in SQL databases for maintaining data consistency and integrity.
Collection
[
|
...
]