Top "Junction-table" questions

A junction table is a table that contains common fields from two or more tables and is the canonical way to implement Many-to-Many relations in SQL and Relational-type databases.

How to retrieve the last autoincremented ID from a SQLite table?

I have a table Messages with columns ID (primary key, autoincrement) and Content (text). I have a table Users with …

database sqlite primary-key auto-increment junction-table
MS SQL creating many-to-many relation with a junction table

I'm using Microsoft SQL Server Management Studio and while creating a junction table should I create an ID column for …

sql sql-server many-to-many junction-table
How to configure a One-to-Many relationship in EF

I have the following model public class PageConfig : Base { // Properties Etc.. public ICollection<Image> ScrollerImages { get; set; } } My …

c# entity-framework one-to-many model-binding junction-table
What is the difference between an entity relationship model and a relational model?

I was only able to find the following two differences: The relationships in an E-R model are explicitly defined, while …

database entity-relationship relational junction-table entity-relationship-model
SQL join on junction table with many to many relation

I have three tables, of which 2 are regular data tables and 1 is a many to many junction table. The two …

mysql sql join junction-table
SQL query on multiple tables, one being a junction table

I have a fairly simple database consisting of 4 tables: Table 1: USERS Columns: userID, user_name Table 2: GROUPS Columns: groupID, group_…

sql join junction-table
Why is it not good to have a primary key on a join table?

I was watching a screencast where the author said it is not good to have a primary key on a …

ruby-on-rails database migration primary-key junction-table
In a join table, what's the best workaround for Rails' absence of a composite key?

create_table :categories_posts, :id => false do |t| t.column :category_id, :integer, :null => false t.column :post_…

ruby-on-rails database composite-key junction-table
Can a junction table (join table) also be used for a one-to-many relationship?

According to the definition, a Junction Table (bridge table/link table) is used for many-to-many relationships, when used like this: …

many-to-many database one-to-many junction-table