sqlite外键约束中。restrict约束:如果要删除父表,则子表需空。 如果没有定义约束。会报错,需设置一个约束。
Remove foreign key b and unique_together constraint from model like following: class A(models.Model): name = models.CharField(max_length=10) b = models.ForeignKey('B') class Meta: unique_together = (('b','name'),) class B(models.Model): text = models.CharField(max_length=10) --...
Discover how to use SQL ALTER TABLE DROP CONSTRAINT to remove data integrity constraints. Learn syntax and examples for dropping PRIMARY KEY, UNIQUE, and other constraints.
ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (confluence_qa.CONTENTPROPERTIES, CONSTRAINT FK3fly21xfk13rqh63txw2t6k2v FOREIGN KEY (CONTENTID) REFERENCES CONTENT (CONTENTID)) ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key...
SQL Data Types SQL View SQL CREATE VIEW SQL Index SQL CREATE INDEX SQL DROP TABLE SQL TRUNCATE TABLE SQL USE SQL CREATE DATABASE SQL DROP DATABASE SQL GRANT SQL REVOKE SQL CONSTRAINT NOT NULL Constraint DEFAULT Constraint UNIQUE Constraint CHECK Constraint PRIMARY KEY FOREIGN KEY SQL ALTER TABLE...
Cannot add or update a child row: a foreign key constraint fails Cannot bind to the target method because its signature or security transparency is not compatible with that of the delegate type Cannot convert from system.threading.tasks.task <byte[]> to byte[] cannot convert string to double...
constraint_name="_conda_package_build_uc", ) # add channel column batch_op.add_column( Column("channel_id", INTEGER) ) batch_op.create_foreign_key("fk_channel_id", "conda_channel", ["channel_id"], ["id"]) # re-add the constraint with the channel column batch_op.create_unique_co...
Can't add datetime column with default value in SQL Server 2005 Can't change the currente collate of my database Can't copy the result of a query? Can't declare table parameter as input to stored procedure Can't delete rows from Mgt Studio view Can't Enable Foreign Key Constraint (Msg...
(0) NULL DEFAULT NULL COMMENT '创建时间', PRIMARY KEY (`id`) USING BTREE, INDEX `manager_fk`(`manager_id`) USING BTREE, CONSTRAINT `manager_fk` FOREIGN KEY (`manager_id`) REFERENCES `user` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE...
(HY000): Error on rename of '.\eltas\test' to '.\eltas\#sql2-704-2' (errno: 152) now, i try to remove the constraint by it's constraint name: mysql> alter table test drop foreign key FKref_ID; ERROR 1025 (HY000): Error on rename of '.\eltas\test' to '.\eltas\#sql2...