Lesson 8 - MySQL Step By Step: More Queries And the M:N Relationship
In the previous lesson, MySQL Step By Step: Queries Over Multipe Tables (JOIN), we learned
JOINs and now we
can query through multiple tables. Today, we're going to continue in this
manner. We'll create one more table for comments and then learn about the M:N
We're going to extend our content management system and create a
comment table. The comment (similarly as the article) is bound to
the user. But it's also bound to the article. That means, we have two 1:N
relationship here. One article can have N comments and also one user can have N
comments. A comment always belongs to one user and one article.
Since the comment is the part and it belongs to two wholes (to the article and the user), it'll contain 2 columns with the article id and the user id. Such columns storing the id of an entry from another table are called
...End of the preview...
You've come here and that's great! We believe that the first lessons showed you something new and useful
Do you want to continue the course? Go to the premium section.
Warning, by buying just this lesson you'll lose the limited 15% discount for the package of all the lessons.
- Unlimited and permanent access to individual lessons.
- High quality IT knowledge.
- Skills to help you get your dream and well-paid job.
Requested article covers this content:
In this tutorial, we'll continue to make queries through multiple MySQL tables and learn how to create the M:N relationship using an associative table.
You gain credits by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.