Here, the query is successfully sql-executed as the rows we are trying to insert in theOrderstable have valid values in thecustomer_idcolumn, which has aFOREIGN KEYconstraint in theCustomerstable. Insertion Failure in Foreign Key An insertion failure occurs when a value is entered into a table...
SQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails 异常原因:两张表存在外键关联并且有级联操作,级联更新或级联删除等 1.(此处为)设置的外键与另一个表中的唯一索引列(一般是主键)中的值不匹配 2.添加的外键列与另一个表的唯一索引列(一般是主键)的数...
queryRunner.update("SET FOREIGN_KEY_CHECKS = 0;"); queryRunner.update(sql, pid); queryRunner.update("SET FOREIGN_KEY_CHECKS = 1;"); SQL语句 出现外键约束无法删除时候 添加首位两句话临时解除外键检查
SQL 复制 SELECT fk.name AS ForeignKeyName , t_parent.name AS ParentTableName , c_parent.name AS ParentColumnName , t_child.name AS ReferencedTableName , c_child.name AS ReferencedColumnName FROM sys.foreign_keys fk INNER JOIN sys.foreign_key_columns fkc ON fkc.constraint_object_i...
SQL FOREIGN KEY Constraint on CREATE TABLEThe following SQL creates a FOREIGN KEY on the "P_Id" column when the "Orders" table is created:MySQL:CREATE TABLE Orders ( O_Id int NOT NULL, OrderNo int NOT NULL, P_Id int, PRIMARY KEY (O_Id), FOREIGN KEY (P_Id) REFERENCES Persons(P_...
SQL Server / Oracle / MS Access: CREATETABLEOrders ( OrderID intNOTNULLPRIMARYKEY, OrderNumber intNOTNULL, PersonID intFOREIGNKEYREFERENCESPersons(PersonID) ); To allow naming of aFOREIGN KEYconstraint, and for defining aFOREIGN KEYconstraint on multiple columns, use the following SQL syntax: ...
error: 1215 Cannot add foreign key constraint I add the db dump CREATE TABLE IF NOT EXISTS `groups` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) NOT NULL, `language` varchar(255) NOT NULL, `order` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHA...
然后再设置外键约束: SET FOREIGN_KEY_CHECKS=1; 2. MySQL 5.1.48 导入 MySQL 5.7.18 时遇到 T FOREIGN_KEY_CHECKS = 0 错误的解决方法 #1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘T FOREIGN...
constraint_object_idintFOREIGN KEY 條件約束的標識碼。 constraint_column_idint組成FOREIGN KEY的數據行標識碼或數據行集合(1..n,其中 n是資料行數目)。 parent_object_idint條件約束之父系的標識碼,這是參考物件。 parent_column_idint父數據行的標識碼,這是參考數據行。
ERROR 1215 (HY000): Cannot add foreign key constraint 最近在建表时遇到了这个错误,然后找了下找到了解决办法,记录下: 本来是要建两张表: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 createtabledepartment( idint, namevarchar(20) ); createtableemployee( ...