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

Posted by Chris Gauthier
Chris Gauthier
Courses Plus Student 6,434 Points

Grabbing a count of genres in a library table

Hello,

Im working on this challenge:

https://teamtreehouse.com/library/reporting-with-sql/aggregate-and-numeric-functions/counting-groups

here is my query:

select distinct count(genre) as total_genres from books;

The error is "Your query does not have the right count".

Whats wrong with my query?

2 Answers

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

You have "distinct" in the wrong place.

A single aggregate field is always distinct, so it doesn't do anything in front of count. But it would make a difference in the count itself if you put it inside the count function.

Chris Gauthier
PLUS
Chris Gauthier
Courses Plus Student 6,434 Points
Chris Gauthier
Chris Gauthier
Courses Plus Student 6,434 Points

Thanks, worked fine and im on to the next step!