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Databases

Posted by Kirk Billings
Kirk Billings
3,420 Points

Difficulty with Code Challenge.

I am having severe difficulties with the Task Challenge 3 with Auto_Incrementing keys. I have struggled to get past this Challenge. Is there anyway to help me determine what is wrong with the following command?

ALTER TABLE t_movies ADD COLUMN fk_genre_id INTEGER FOREIGN KEY ADD CONSTRAINT (fk_genre_id) REFERENCE t_genres(pk_id);

Thanks in advance for your help.

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

Could you provide a link to the challenge page? Or at least mention which course this is for.

2 Answers

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points
  • you do need a comma before "ADD CONSTRAINT ..."
  • the term "FOREIGN KEY" comes after "CONSTRAINT"
  • the term "REFERENCES" must be spelled with an "S"

So the revised query would be:

ALTER TABLE t_movies ADD COLUMN fk_genre_id INTEGER, ADD CONSTRAINT FOREIGN KEY (fk_genre_id) REFERENCES t_genres(pk_id);
Kirk Billings
Kirk Billings
3,420 Points
Kirk Billings
Kirk Billings
3,420 Points

Steven,

Thanks for your help. Here is the link. I tried adding a comma without success.

Thanks again. Any insights are welcome. I am still struggling.

https://teamtreehouse.com/library/database-foundations/joining-relational-data-between-tables-in-sql/keys-and-autoincrementing-values-2

Regards,

Kirk

Kirk Billings
Kirk Billings
3,420 Points

Steve,

Thank you very much. That worked great.

Regards,

Kirk