Cannot add foreign key constraint怎么办
WebJun 10, 2024 · MySQL创建外键时,总是会遇到这样的报错:Cannot add foreign key constraint,有时觉得不明所以,摸不着头脑。 报错信息表示创建外键失败,应该从以下两个方面来检查: 1)设置的外键字段一定不 … Web4. Please ensure that both the tables are in InnoDB format. Even if one is in MyISAM format, then, foreign key constraint wont work. Also, another thing is that, both the fields should be of the same type. If one is INT, then the other should also be INT. If one is VARCHAR, the other should also be VARCHAR, etc.
Cannot add foreign key constraint怎么办
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Web[PDOException] SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint This error happened because the foreign key (type) in [user table] is different from the primary key (type) in the [colors table]. To solve this problem, you should change the primary key in the [colors table]: $table->tinyIncrements('id');
WebMay 15, 2024 · mysql添加外键报错:Cannot add foreign key constraint 问题描述: error1512 Cannot add foreign key constraint或是error1452 Cannot add foreign key constraint等。 解决 办法: 首先定义一个表a(字段名有id(主键),name,pas), 表b(id(主键),user_phone... MySQL报错cannot add foreign key constraint解决方法 55642; Python中列 … WebJun 7, 2024 · CONSTRAINT fk_user_in_org__org_roles1 FOREIGN KEY (`role`) REFERENCES students.org_roles(`label`) You need a index on the table org_roles for the column label CREATE TABLE IF NOT EXISTS students.org_roles ( `org_id` INT NOT NULL, `label` VARCHAR(32) NOT NULL, KEy (`label`), PRIMARY KEY (`org_id`, …
WebJan 23, 2024 · Cannot add foreign key constraint 错误解决办法 产生这个错误的多数原因有一下两点: 1,两张表里要设主键和外键的字段的数据类型或者数据长度不一样 (例如这个是int 另外一个是tinyint,或者都是int,但是设置的长度不同) WebJul 18, 2024 · Cannot add foreign key constraint 0.094 sec – GEORGE Reed. Jul 17, 2013 at 11:26. 2. Thanks a lot. In my case the difference was just that on Table A the field was Int(10) UNSIGNED and on Table B it was Int(10). That's enough for a type mismatch! :o – Ricardo Appleton. May 20, 2014 at 19:06
WebAug 9, 2024 · 最近在做新生入学系统,学生表中包括新生的班级,专业等信息,班级,专业就需要和班级表,专业表进行关联,但是在添加外键的过程中却出现了“Cannot add foreign key constraint” 的问题,也就是不能添加外键约束,为什么就不能添加外键呢?. 出现这个问 …
WebOct 19, 2012 · #1452 - Cannot add or update a child row: a foreign key constraint fails (`accounts`.`user_email`, CONSTRAINT `user_email_ibfk_2` FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON DELETE CASCADE ON UPDATE CASCADE) I have a feeling I must be missing something obvious here. hunstanton campsites norfolkWebNov 8, 2024 · 如果出现”cannot add foreign key constraint”的情况,建议先检查一下,主表是否有主键以及从表关联字段是否为从表主键,然后,核对从表字段与主表关联字段的数据类型是否相同,其中是否有不符合的数据 (不好弄就先把数据备份,然后删完了试一下,如果可 … martymusic/acoustic blues strumWebJul 12, 2016 · Navicat 关联表创建外键 1215 Cannot add foreign key constraint 创建外键报错,1215 connot add foreign key constraint。 报错原因 主从表引擎不一致,只有InnoDB支持外键,所以主从表的引擎都设置为InnoDB。 主从表关联字段的类型与长度不一致,所以请查看下字段类型与长度是否一致。 hunstanton case studyWebMar 3, 2024 · This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table. Because primary key constraints guarantee unique data, they are frequently defined on an identity column. When you specify a primary key constraint for a table, the Database Engine enforces data uniqueness by automatically ... marty music acousticWeb3) The foreign key name is a duplicate of an already existing key. Check that the name of your foreign key is unique within your database. Just add a few random characters to the end of your key name to test for this. 4) One or both of your tables is a MyISAM table. In order to use foreign keys, the tables must both be InnoDB. hunstanton caravan park searlesWebMar 21, 2016 · The FOREIGN KEY clause is specified in the child table. It will reject any INSERT or UPDATE operation that attempts to create a foreign key value in a child table if there is no a matching candidate key value in the parent table. To remove your error, insert the Queens artist in your Artist table first and then you can insert it into Albums table. marty music blue on blackWeb2. When the referenced key is not a primary or unique key. You can not have two primary keys, so other referenced keys should be defined unique. unique:true. return sequelize.define ('Users', { idUsers: { primaryKey: … marty music bb king