-- The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. -- A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in ...
A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table, and the table with the ...
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 ...
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