My Question is about the idea of combining two junction tables into one, for similarly related tables. Please read to see what I mean. Also note that this is indeed a problem I am faced with and there
EDIT: I swapped out my structural implementation, but my problem still remains the same; i.e. First creating a Publication object (if it doesn\'t yet ex开发者_运维技巧ist) before creating the SvcReque
I am having a hard time trying to figure out if the following design pattern is acceptable. I have the following requirements (and some other more) for a relational model:
I have DB that contains 3 tables - Actors, Films, Actors_Films.2 of the tables have a many-to-many relationship (Actors and Films), which is modelled using a junction table (Actors_Films).
In my database application, when I try t开发者_如何学Co attach a page to a site, I get the following error:
With this kind of design, I would like to create a functionality with which to add and delete records from the junction table.
Let\'s say we have a Product table, and Order table and a (junction table) ProductOrder. ProductOrder开发者_JS百科 will have an ProductID and an OrderID.
I have a table Messages with columns ID (primary key, autoincrement) and Content (text). I have a table Users with columns username (primary key, text) and Hash.
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