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Development Tools Database Foundations Joining Relational Data Between Tables in SQL Joining Tables and Aliasing

Forgot to add genres_id column

Hello,

I've been attempting to create the Database on mySQL workbench as I have been watching through the videos.

It seems somewhere I have possibly forgotten to add the genres_id as it is not currently shown in my 'genres' table.

This is the error message being returned:

"10:00:56 SELECT * FROM movies JOIN genres ON movies.genre_id = genres_id LIMIT 0, 1000 Error Code: 1054. Unknown column 'genres_id' in 'on clause' 0.000 sec"

Could someone please advise what statement I would require to solve this error being returned?

I have attempted adding it myself:

3 32 14:15:04 ALTER TABLE genres ADD COLUMN genres_id INTEGER 0 row(s) affected Records: 0 Duplicates: 0 Warnings: 0 0.078 sec

I would guess that it is completely wrong as when I use the statement from the video:

SELECT * FROM movies JOIN genres ON movies.genre_id = genres_id;

There are absolutely no values returned across the 7 columns (id, title, year, genre_id, id, name, genres_id)

It would be much appreciated if someone could help me out. Thank you in advance.

1 Answer

Jason Anders
MOD
Jason Anders
Treehouse Moderator 145,627 Points

Hi Michael,

Try ->

ALTER TABLE movies ADD COLUMN genre_id INTEGER NULL, ADD CONSTRAINT FOREIGN KEY (genre_id) REFERENCES genres(id);

Hope that works. :)