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PHP Integrating PHP with Databases Using Relational Tables JOINing Tables

Posted by Raymond Moore
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Raymond Moore
Front End Web Development Techdegree Student 11,166 Points

Joining Table HELP!

We will be writing ONLY the SQL query for this challenge.

The library database contains a Media table with the columns media_id, title, img, format, year and category. It also contains a Genres table with the columns genre_id and genre. To join these tables, there is a Media_Genres table that contains the column media_id and genre_id

Add to the following SELECT statement to JOIN the Media table and the Genres table using the joining table Media_Genres.

SELECT * FROM Media WHERE media_id=3;

My Answer: SELECT * FROM Media JOIN Genres ON Media_Genres.genre_id = Genres.genres_id WHERE media_id = 3;

However, it continues to tell me my answer is incorrect and please try your code again. Could someone help me out here with a little understanding.

Thanks

3 Answers

Gabriel Plackey
Gabriel Plackey
11,064 Points
Gabriel Plackey
Gabriel Plackey
11,064 Points

You're missing the join onto media_genres like tomd said. Then you still will have the ambiguous column name on the where clause.

SELECT * FROM Media 
JOIN Media_Genres ON Media.media_id = Media_Genres.media_id 
JOIN Genres ON Media_Genres.genre_id = Genres.genres_id 
WHERE Media.media_id = 3;
tomd
tomd
16,701 Points
tomd
tomd
16,701 Points

This might not be much help, but there are 3 tables. The media table, the genre table and the Media_Genre table. You are only joining 2 tables. You'll need to join the media table to the Media_Genre table and the genre table to the Media_Genre table.

Raymond Moore
seal-mask
.a{fill-rule:evenodd;}techdegree
Raymond Moore
Front End Web Development Techdegree Student 11,166 Points
Raymond Moore
.a{fill-rule:evenodd;}techdegree
Raymond Moore
Front End Web Development Techdegree Student 11,166 Points

I thought about adding two joins, but was not for sure. Thank both of you very much. :)

Ray.