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 Reporting with SQL Aggregate and Numeric Functions Counting Groups


SQL is driving me crazy today. I am just missing something. Please help

**challenge*In the library database there's a books table. There are id, title, author, genre and first_published columns.

Write a query to count all the unique genres in the books table. Alias it as total_genres.

Type in your command below, then press Ctrl-Enter.

Bummer: There's something wrong with your SQL statement. Please review your code and try again. genre,

***my answer

SELECT genre, COUNT (DISTINCT genres) AS "total_genres" FROM books;

1 Answer

  1. You should select just the count, not the genre too.
  2. The genres in COUNT (DISTINCT genres) should just be genre.