使用 InnoDB 引擎创建表时出现 MySQL 1005 错误

Question

当我尝试创建具有以下定义的表时，

CREATE TABLE `demo` (
    `id` INT(11) NOT NULL auto_increment,
    `x_id` INT(11) NOT NULL,
    `y_id` INT(11) NOT NULL,
    `z_id` INT(11) NOT NULL,
    `status` TINYINT unsigned NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY  (`id`),
    CONSTRAINT UNIQUE INDEX(x_id, y_id)
) ENGINE=InnoDB;

OperationalError 发生:

_mysql_exceptions.OperationalError:
(1005, "Can't create table 'xxx.frm' (errno: -1)")

如果我删除尾随的 ENGINE=InnoDB，它会起作用。

这背后的原因是什么？

MySQL版本是mysql Ver 14.12 Distrib 5.0.84，适用于使用 readline 5.2 的 pc-linux-gnu (i686)

Answer 1

If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it. It must have the right column names and types, and it must have indexes on the referenced keys, as stated earlier. If these are not satisfied, MySQL returns error number 1005 and refers to error 150 in the error message.

If MySQL reports an error number 1005 from a CREATE TABLE statement, and the error message refers to error 150, table creation failed because a foreign key constraint was not correctly formed. Similarly, if an ALTER TABLE fails and it refers to error 150, that means a foreign key definition would be incorrectly formed for the altered table. You can use SHOW ENGINE INNODB STATUS to display a detailed explanation of the most recent InnoDB foreign key error in the server.

Foreign Key Constraints - Error 1005