Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Databases Querying Relational Databases Subqueries Subqueries

Posted by George Waller
George Waller
5,228 Points

Subquery using IN

I don't understand why this isn't selecting the ModelName's?

SELECT ModelName FROM Model INNER JOIN Car ON Model.ModelID = Car.ModelID WHERE Model.ModelID IN (SELECT ModelID FROM Car WHERE StickerPrice > 30000);

1 Answer

Steven Parker
Steven Parker
231,184 Points
Steven Parker
Steven Parker
231,184 Points

You don't need a JOIN here, just the subquery:

SELECT ModelName FROM Model
  WHERE ModelID IN (SELECT ModelID FROM Car WHERE StickerPrice > 30000);