MySQL 5.0.11 错误代码 #1215 : cannot add foreign key constraint

Question

根据我阅读相关SO答案和官方文档后的理解，我可能会遇到列类型不匹配的情况或没有定义所需的INDEX情况。但是我无法解决我的案子。

下表创建成功

CREATE TABLE `parts` (
`partnum_rev` varchar(255) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part number with revision number',
`status` char(4) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part is live or dead',
`partdef` varchar(255) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part definition',
`makebuy` varchar(4) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part is maked or buyed',
PRIMARY KEY (`partnum_rev`), 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='table that part specific data is hold'

下表给出了 MySQL - 错误代码 1215，无法添加外键约束。

partnum_rev 是 parts 表的主键，所以我不明白我的原因。

你能帮帮我吗？

最好的问候

CREATE TABLE `bom` (
`lcn` varchar(255) COLLATE utf8_unicode_ci NOT NULL COMMENT 'logistics control number',
`status` char(4) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part is live or dead',
`partnum_rev` varchar(255) COLLATE utf8_unicode_ci NOT NULL COMMENT 'part number with revision number',
`effective_date` date NOT NULL COMMENT 'drawing effective date',
`abolish_date` date DEFAULT NULL COMMENT 'drawing abolish date',
`parent_partnum_rev` varchar(255) COLLATE utf8_unicode_ci NOT NULL COMMENT 'parent part number with revision number',
`bomlevel` tinyint(3) unsigned NOT NULL COMMENT 'bom level',
`quantity` decimal NOT NULL COMMENT 'quantity',
`quantity_unit` char(2) COLLATE utf8_unicode_ci NOT NULL COMMENT 'quantity unit',
`usage_ratio` decimal DEFAULT NULL COMMENT 'usage ratio',
`mttr` decimal DEFAULT NULL COMMENT 'mean time to repair',
`purchasecost` decimal unsigned DEFAULT NULL COMMENT 'purchasing cost',
`moneyunit` varchar(3) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT 'purchasing cost monetary unit',
PRIMARY KEY (`lcn`), 
FOREIGN KEY (`partnum_rev`) REFERENCES part(`partnum_rev`) ON UPDATE CASCADE 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='table for bill of material'

Answer 1

foreign key 子句是错误的 - 您的表称为 parts(复数!)，而不是 part。只需使用正确的表名:

FOREIGN KEY (`partnum_rev`) REFERENCES parts(`partnum_rev`) ON UPDATE CASCADE