alter table staff add constraint fk_staff foreign key(student_with) references students on update cascade on delete set null; but when i try to drop the foreign key like this; alter table staff drop foreign key fk_staff; it says query ok, 2 rows affected <0.09sec> ...
For DROP FOREIGN KEY constraint_name with pt-online-schema-change requires specifying _constraint_name rather than the real constraint_name. This is due to a limitation in MySQL: pt-online-schema-change adds a leading underscore to foreign key constraint names when creating the new table. Here...
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...
Complain that it is needed by a foreign key constraint, or silently drop and re-create the index? [21 Aug 2008 12:29] Marko Mäkelä When a FOREIGN KEY is created, MySQL silently creates the required INDEX on the referencing table. MySQL also silently drops that index when the user ...
6, Error 'Cannot delete or update a parent row: a foreign key constraint fails' on query. Default database: 'd'. Query: 'DROP TABLE IF EXISTS `t1`,`t2`,`t3`' I expect slave to successfully drop the database. But it does not. The fix ofhttp://bugs.mysql.com/bug.php?id=2167...
Hi MySQL team, Does MySQL support any way to update Foreign Key without dropping the current constraint? If not, please let me know about the team's plan in future Thank you! Regards, Trung DangNavigate: Previous Message• Next Message Options: Reply• Quote ...
ALTER TABLE `blog` ADD PRIMARY KEY (`id`) ; (Note that this statement will return an error if any duplicate value exist for the id column, OR if there are any NULL values stored in that column, of if there is already a PRIMARY KEY constraint defined on the table.) ...
create table students(reg_no int, name varchar(10), staff_adv int, primary key (reg_no)) engine = InnoDB; create table staff (staff_id int, name varchar(10), student_with int, primary key (student_with)) engine = InnoDB; alter table staff add constraint fk_staff foreign key(student...
Re: dropping foreign keysPosted by: Devart Team Date: January 10, 2012 02:09AM Check your script firstly. The third query 'alter table staff add constraint...' is not working, the syntax is incorrect. Devart Company, MySQL management tools http://www.devart.com/dbforge/mysql/...
Hi MySQL team, Does MySQL support any way to update Foreign Key without dropping the current constraint? If not, please let me know about the team's plan in future Thank you! Regards, Trung Dang Subject Written By Posted Update Foreign Key constrant without dropping ...