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
Jennifer Fry
9,855 PointsDatabase Foundations Stage 6
I'm having an issue with the first exercise of this stage:
'Create a genres table called "t_genres" with an auto incrementing primary key called "pk_id" and a unique column called "uk_name" that can't be null. The "uk_name" is a varchar of up to 45 characters.'
I entered:
CREATE TABLE t_genres (pk_id INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY, uk_name NOT NULL VARCHAR(45) UNIQUE KEY);
But this seems to error out...what am I missing here?
2 Answers
Jennifer Fry
9,855 PointsAnswered my own question!
CREATE TABLE t_genres (pk_id INTEGER AUTO_INCREMENT PRIMARY KEY, uk_name VARCHAR(45) NOT NULL UNIQUE KEY);
appears to work
However, does the order of where 'NOT NULL' appears in the unique column name matter necessarily?
John W
21,558 PointsYes. According to the MySQL 5.1 reference manual, under column_definition, data type (e.g. varchar, text, integer, etc) should precede all other keywords (e.g. not null, unique, primary) for each create_definition.