A Primary Key is a column (or combination of columns) in a table that uniquely identifies each row. A table can only have one primary key. References the primary key in another table. The values in ...

🔄 What is AUTO_INCREMENT in an SQL Table? AUTO_INCREMENT is a feature in SQL used with a column to automatically generate a unique, sequential number whenever a new record is inserted into a table.

I'm working on a web app, and it part of it, there is a very simple database-driven file/document manager. As a file manager, there is the possibility of sub-folders. So in the DB, I have the ...