Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Databases Querying Relational Databases Table Relationships One to Many Relationships

Posted by John Gu
John Gu
6,891 Points

Which is ONE and which is MANY? Products or Sales?

So in this example, the Products is the ONE table, and the Sales is the MANY table in the ONE to MANY relationship, is that right? (because one product can relate to many sales). I get a bit thrown off because Products is listed on the right while Sales is listed on the left.

1 Answer

Steven Parker
Steven Parker
221,451 Points
Steven Parker
Steven Parker
221,451 Points

It sounds like you've got it. :+1:

"A Sale has 1 product but a Product can be on many sales."

When you list the "many" table first, it's called a "many-to-one" relationship.