Then add the foreign key constraints back ALTER TABLE table_name1 ADD FOREIGN KEY (table2_id) REFERENCES table2(id) ON DELETE SET NULL; ALTER TABLE tablename2 ADD FOREIGN KEY (table1_id) REFERENCES table1(id) ON DELETE SET NULL; Need a good GUI Tool for MySQL? TablePlus is a moder...
要禁用外键约束,可以使用以下SQL语句: SETFOREIGN_KEY_CHECKS=0; 1. 这条语句会暂时禁用当前数据库的外键约束。执行完相关操作后,可以通过以下语句重新启用外键约束: SETFOREIGN_KEY_CHECKS=1; 1. 2. 禁用唯一约束和主键约束 对于唯一约束和主键约束,MySQL并没有直接的禁用方式。通常的解决方案是删除约束,进行操作...
在上面的代码中,DisableForeignKeyConstraintWhenMigrating 被设置为 true,因此在执行 AutoMigrate 时,GORM 不会创建外键约束。 3. 禁用外键约束的具体 SQL 命令或操作步骤 在GORM 中,这一操作是通过配置选项完成的,而不是通过直接的 SQL 命令。GORM 会根据配置自动调整其行为。如果你需要在原生 SQL 中执行类似的操作...
以外键为例,添加外键的 SQL 语句如下: ALTERTABLEyour_table_nameADDCONSTRAINTyour_foreign_key_nameFOREIGNKEY(column_name)REFERENCESother_table_name(other_column_name); 1. 2. 3. 4. ADD CONSTRAINT your_foreign_key_name:添加约束的名字。 FOREIGN KEY (column_name):指定作为外键的列。 REFERENCES other_...
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`smb_man`.`busi_table`, CONSTRAINT `busi_table_ibfk_1` FOREIGN KEY (`repo_id`) REFERENCES `repo_table` (`repo_id`))3）增加级联操作 mysql> alter table busi_table -> add constraint id...
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mysql> insert into t_tudent values(112,'爱国的吴京',6); ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`test_wl`.`t_tudent`, CONSTRAINT `t_tudent_ibfk_1` FOREIGN KEY (`t_class`) REFERENCES `t_class` (`class_num`)) ...
ALTER TABLE student ADD CONSTRAINT fk_grade_student_gradeid FOREIGN KEY(gradeID) REFERENCES grade(gradeID) #在subject中创建grade外键 1. 2. 3. 4. 5. 6. ALTER TABLE SUBJECT ADD CONSTRAINT FK_Grade_Subject_Gradeid FOREIGN KEY(gradeID) ...
Foreign key constraint error with delete Free up SQL Server Memory Frequently getting Provider ran out of memory error Full database backup can full transection log Files? Full Text Search Populate Status - Processing notifications FullText creation fails with Error: 30059, Severity: 16, State: 1...