在Mysql中取消外键约束: SET FOREIGN_KEY_CHECKS=0 执行 truncatetablename 然后再设置外键约束: SET FOREIGN_KEY_CHECKS=1
Can truncate table with foreign key constraints without having to drop the keys? I tried alter table NOCHECK CONSTRAINT ALL without avail. NorthernSoul SSCertifiable Points: 6869 More actions May 25, 2017 at 8:18 am #1944175 You can't truncate a table that has a foreign key constraint, ...
外键约束(Foreign Key Constraint)是一种数据库完整性约束,用于确保两个表之间的数据一致性和参照完整性。具体来说,外键是一个表中的字段,它引用了另一个表(称为父表)的主键或唯一键。通过外键约束,可以确保一个表中的记录只能引用另一个表中实际存在的记录。 2. 说明为什么不能在存在外键约束的情况下直接截断...
SQL> alter table tbl_a add constraint pk_tbl_a primary key(id); Table altered. SQL> alter table tbl_b add constraint pk_tbl_b primary key(id); Table altered. SQL> alter table tbl_b add constraint fk_tbl_b_a foreign key(a_id) references tbl_a(id); Table altered. 1. 2. 3. ...
MySQL清空表提示Cannot truncate a table referenced in a foreign key constraint 在MySQL执行truncate table xxx时, 出现了这个报错[Err] 1701 -Cannot truncate a table referenced in a foreign key constraint.. 意思是 无法截断外键约束中引用的表
Last night, I was truncating some tables from an alien database, and while truncating one table I got below error, which is logical because tables were related by foreign key constraintMsg 4712, Level 16, State 1, Line 1Cannot truncate table ' ' because it is being referenced by a...
在truncate表的时候报告以下错误,意思是有的表有外键关联,不能清空。 SQLSTATE[42000]: Syntax error or access violation: 1701 Cannot truncate a table referenced in a foreign key constraint (alerting.datapoints, CONSTRAINT datapoints_sensor_id_foreign FOREIGN KEY (sensor_id) REFERENCES alerting.sensors (...
[foreignId] [int] NOT NULL,CONSTRAINT [PK_Table_1] PRIMARY KEY CLUSTERED([ID] ASC)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]) ON [PRIMARY]GOCREATE TABLE [dbo].[Table_2]([Id] [int] NOT NULL,CONSTRAINT [PK_Table_2] PRIMARY KEY CLUSTERED(...
+---+---+---+ | id | customer | orderTotal | +---+---+---+ +---+---+---+ (0 rows) See also DELETE Foreign Key constraint Online Schema Changes Was this helpful? On this page Ask AI
ADD CONSTRAINT FK_ConstraintName FOREIGN KEY (ForeignKeyColumn) REFERENCES MainTable (PrimaryKeyColumn); In this example, you need to drop the foreign key constraints before truncating the main table and then recreate them afterward. Example 3: TRUNCATE with Identity ColumnsIf your table has an ide...