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Development Tools Database Foundations Joining Relational Data Between Tables in SQL Keys and Auto-Incrementing Values

Posted by Wilner Charles
Wilner Charles
874 Points

I'm a little confused with the Keys and Auto-Incrementing Values part.

In challenge task one it ask me to: 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.

In my answer I wrote:

CREATE TABLE t_genres (pk_id NOT NULL AUTO INCREMENT PRIMARY KEY, uk_name VARCHAR (45)NOT NULL UNIQUE);

What am I doing wrong?

1 Answer

Jeff Busch
Jeff Busch
19,287 Points
Jeff Busch
Jeff Busch
19,287 Points

Hi Wilner'

You're close. For the PRIMARY KEY NOT NULL is the default so get rid of NOT NULL. I'm not positive, but you should probably add a space between (45) and NOT. And then, UNIQUE NEEDS KEY after it. Almost forgot, pk_id needs INTEGER after it.

Jeff