Question

I’m trying link two tables together using a foreign key. One table is users, the other is userInfo. When I delete a user I also want to delete their info as well. When I delete a user from the users table their entry in usersInfo is still there. I can’t seem to figure out what I’m doing wrong.

CREATE TABLE users (
userid INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(30) NOT NULL,
email VARCHAR(50) NOT NULL,
password VARCHAR(32) NOT NULL,
userlevel INT UNSIGNED NOT NULL,
rating int,
organization int(1),
timestamp varchar(20) NOT NULL,
);

Here is my table for userinfo. Yes, I know it could be in the same table. I’m just doing this for an easy example.

CREATE TABLE usersInfo(
userid int  auto_increment NOT NULL,
userlocation varchar(50),
about varchar(300),
userkeywords varchar(150),
FOREIGN KEY(userid) REFERENCES users(userid) ON DELETE CASCADE ON UPDATE CASCADE
);

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Edit – problem solved. Thanks to everyone who helped.

Added TYPE = InnoDB at the end of the CREATE TABLE statements.

Answer 1

Add ENGINE=INNODB to these CREATE TABLE statements to ensure they’re InnoDB tables. MySQL versions below 5.5.5 will default to MyISAM, which does not support foreign-key relationships, but which will not throw an error if you define a foreign-key relationship either.