Getting 1005 constraint error on create table

Question

I am making a script that reading some php files creates a SQL file. I have almost finished, but I am getting a MySQL error that I can't figure it out :(

This is the SQL code:

CREATE TABLE `tag` (
  `id` INT(11) NOT NULL AUTO_INCREMENT COMMENT 'Id único de cada tag',
  `name` VARCHAR(20) COLLATE utf8_unicode_ci NOT NULL DEFAULT '' COMMENT 'Nombre de la tag',
  `id_user` INT(11) NOT NULL COMMENT 'Id del usuario',
  `created_at` DATETIME NOT NULL COMMENT 'Fecha de creación del registro',
  `updated_at` DATETIME NULL COMMENT 'Fecha de última modificación del registro',
  PRIMARY KEY (`id`),
  KEY `fk_tag_user_idx` (`id_user`),
  CONSTRAINT `fk_tag_user` FOREIGN KEY (`id_user`) REFERENCES `user` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `user` (
  `id` INT(11) NOT NULL AUTO_INCREMENT COMMENT 'Id único de un usuario',
  `user` VARCHAR(50) COLLATE utf8_unicode_ci NOT NULL DEFAULT '' COMMENT 'Nombre de usuario',
  `pass` VARCHAR(100) COLLATE utf8_unicode_ci NOT NULL DEFAULT '' COMMENT 'Contraseña del usuario',
  `num_photos` INT(11) NOT NULL DEFAULT '0' COMMENT 'Número de fotos de un usuario',
  `score` FLOAT NOT NULL DEFAULT '0' COMMENT 'Puntuación del usuario',
  `active` TINYINT(1) NOT NULL DEFAULT '1' COMMENT 'Usuario activo 1 o no 0',
  `last_login` DATETIME NOT NULL COMMENT 'Fecha de la última vez que inició sesión',
  `notes` TEXT NOT NULL DEFAULT '' COMMENT 'Notas sobre el usuario',
  `created_at` DATETIME NOT NULL COMMENT 'Fecha de creación del registro',
  `updated_at` DATETIME NULL COMMENT 'Fecha de última modificación del registro',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

There are more tables, but these are the first two and it already crashes with:

#1005: Can't create table `tag` (Error: 150)

The script starts with SET FOREIGN_KEY_CHECKS = 0; and ends with SET FOREIGN_KEY_CHECKS = 1;

Any help would be appreciated, thanks!!

Answer 1

I think the issue is of ordering of query, look into this line:

KEY `fk_tag_user_idx` (`id_user`),
  CONSTRAINT `fk_tag_user` FOREIGN KEY (`id_user`) REFERENCES `user` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

here you are referring to the table user, which is not created so far as the query to create user is below and which runs after first query.

So create the user table first and then tag table.