我正在使用 groupName 在 Table2 的 Table1(propType) 上创建 FOREIGN KEY。但我面临以下错误。 选定的列没有兼容的类型,即使它在 mysql 中具有相同的类型
表 1:
CREATE TABLE `configuration_master` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`insertTimestamp` datetime DEFAULT NULL,
`propName` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`propValue` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`propType` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`IsCloudSupport` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`DisplayName` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`updateTimestamp` datetime DEFAULT NULL,
`userId` bigint(20) DEFAULT NULL,
`SYNCCOL1` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL3` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL4` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL5` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL6` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL7` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL8` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL9` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL10` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`prptyp` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `propName` (`propName`),
KEY `FKB54491EB8E326E43` (`userId`),
KEY `proptype_frn_idx` (`propType`),
KEY `ASD_idx` (`prptyp`),
CONSTRAINT `FKB54491EB8E326E43` FOREIGN KEY (`userId`) REFERENCES `user_master` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=86 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
表 2:
CREATE TABLE `config_group` (
`groupName` varchar(45) CHARACTER SET utf8 NOT NULL,
`prop1` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop2` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop3` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop4` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`ADS` int(11) DEFAULT NULL,
`config_groupcol` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`groupName`),
UNIQUE KEY `config_groupcol_UNIQUE` (`config_groupcol`),
UNIQUE KEY `ADS_UNIQUE` (`ADS`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
我正在创建外键如下
ALTER TABLE `konysyncconsoledb7214dev`.`configuration_master`
ADD CONSTRAINT `FK_configGrop`
FOREIGN KEY (`propType`)
REFERENCES `konysyncconsoledb7214dev`.`config_group` (`groupName`)
最佳答案
从mysql手册页找到here
Corresponding columns in the foreign key and the referenced key must have similar data types. The size and sign of integer types must be the same. The length of string types need not be the same. For nonbinary (character) string columns, the character set and collation must be the same.
您的问题是整理。创建以下任何内容都没有问题。请注意,我不得不从其中的一部分中删除您的数据库名称。
哦,因为你没有提供第三个表,我不得不删除那个 FK 约束。但这不是问题。
请注意,可空性不是问题所在。
您决定如何处理归类选择取决于您。但仅此而已。
CREATE TABLE `configuration_master` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`insertTimestamp` datetime DEFAULT NULL,
`propName` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`propValue` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`propType` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`IsCloudSupport` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`DisplayName` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
`updateTimestamp` datetime DEFAULT NULL,
`userId` bigint(20) DEFAULT NULL,
`SYNCCOL1` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL3` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL4` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL5` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL6` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL7` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL8` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL9` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`SYNCCOL10` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`prptyp` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `propName` (`propName`),
KEY `FKB54491EB8E326E43` (`userId`),
KEY `proptype_frn_idx` (`propType`),
KEY `ASD_idx` (`prptyp`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `config_group` (
`groupName` varchar(45) COLLATE utf8_unicode_ci NOT NULL,
`prop1` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop2` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop3` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`prop4` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
`ADS` int(11) DEFAULT NULL,
`config_groupcol` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`groupName`),
UNIQUE KEY `config_groupcol_UNIQUE` (`config_groupcol`),
UNIQUE KEY `ADS_UNIQUE` (`ADS`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
ALTER TABLE `configuration_master`
ADD CONSTRAINT `FK_configGrop`
FOREIGN KEY (`propType`)
REFERENCES `config_group` (`groupName`);
原件的更多细节
这解决了 Barmar 的评论。您为 config_group
创建的表导致 FK 与 ALTER TABLE
的匹配排序规则出现差异。 SHOW FULL COLUMNS 的手册页
来自手册页 here :
If CHARACTER SET X is specified without COLLATE, character set X and its default collation are used.
CREATE TABLE t1 ( col1 CHAR(10) CHARACTER SET utf8 ) CHARACTER SET latin1 COLLATE latin1_bin;
The character set is specified for the column, but the collation is not. The column has character set utf8 and the default collation for utf8, which is utf8_general_ci. To see the default collation for each character set, use the SHOW COLLATION statement.
关于mysql - 所选列没有兼容的类型,即使它具有相同的类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37595974/