针对你提出的问题“duplicate foreign key constraint name 'fk_emp_dept_id'”,我将按照提供的提示,逐步为你分析和解答。 1. 确认问题上下文 在数据库操作中,外键约束用于维护数据表之间的引用完整性。当你看到“duplicate foreign key constraint name”错误时,意味着你试图添加或修改一个已经存在的外键约束名称。
CREATE TABLE tb_product_category( `product_category_id` INT(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, `product_category_name` VARCHAR(100) NOT NULL, `priority` INT(2) DEFAULT '0', `create_time` TIMESTAMP DEFAULT NULL, `shop_id` INT(20) NOT NULL DEFAULT '0', CONSTRAINT `fk_product_s...
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Modified 8 months, 4 weeks ago Type article Status active License CC BY-SA / Gnu FDL History Comments Edit Attachments No attachments exist Error CodeSQLSTATEErrorDescription 1826HY000ER_FK_DUP_NAMEDuplicate foreign key constraint name '%s' ...
So, I've created two tables which reference the same one (say, address and a user has an address and company too). This makes me run into this problem: Constraint created by sequelize: addressId_foreign_idx Results: Both tables will try ...
foreign key constraint of name `test/FKReleaseInfo` already exists. (Note that internally InnoDB adds 'databasename/' in front of the user-defined constraint name). Note that InnoDB's FOREIGN KEY system tables store constraint names as case-insensitive, with the MySQL standard latin1_swedish_...
什么是外键: 图为根据百度百科做的总结 如何使用NAVICAT添加外键: 首先准备一个数据库,里面有两个表表一:a(aid,aname)其中,aid为主键表二:b(bid,bname,aid),b是主键,aid为外键添加外键: NAVICAT生成ER图: 点击图中红框即可: MariaDB(第四章)连接查询,视图,事物,索引,外键 ...
constraintName = 'fk_' + getTableName(name.toLowerCase().substri_ng(0, 3))_ + '' + getTableName(relationshipName.toLowerCase().substring(0, 3))_ + '_id'; Motivation for or Use Case Build Error was something like... liquibase.exception.DatabaseException: Constraint "FK_REL_REL_ID...
EXEC ('ALTER TABLE childTbl ADD CONSTRAINT '+@fk+' FOREIGN KEY (parent_id) REFERENCES parentTbl(id)'); SET @i+=1; TRUNCATE TABLE childTbl; INSERT INTO childTbl (parent_id) VALUES (1); END; DROP TABLE childTbl; DROP TABLE parentTbl; then collated the results. It took a total of...
step (b) Then I tried to alter it with 2 FK definitions. Regardless of what order I try in step (b) I always get the following error for the 2nd constraint definition: ERROR 1061 (42000): Duplicate key name 'cm_article_contents' ...