you dont have article_id
in your table summaries
, you may mean this:
FOREIGN KEY (summary_id) REFERENCES articles(article_id)
if you want make summary_id
as foreign key to article_id in articles table.
But make sure they have same structure properties.
EDIT:
or create a column article_id in summaries table and make it foreign key
CREATE TABLE summaries(
summary_id INT NOT NULL AUTO_INCREMENT,
summary TEXT,
article_id INT,
PRIMARY KEY ( summary_id),
FOREIGN KEY (article_id) REFERENCES articles(article_id)
)ENGINE=INNODB;
EDIt:
INSERT INTO `summaries` (summary,article_id)
VALUES ($yoursummryVar , (SELECT article_id
FROM articles
WHERE ........)
)
i didnt test it.