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15 gru 2009 · The simple way would be to disable the foreign key check; make the changes then re-enable foreign key check. SET FOREIGN_KEY_CHECKS=0; -- to disable them SET FOREIGN_KEY_CHECKS=1; -- to re-enable them
18 wrz 2008 · KCU.TABLE_NAME = 'TABLE_NAME' AND. KCU.COLUMN_NAME = 'TABLE_COLUMN_NAME'. IF @ConstraintName IS NOT NULL EXEC('alter table TABLE_NAME drop CONSTRAINT ' + @ConstraintName) It will delete foreign Key Constraint based on specific table and column. answered Dec 31, 2013 at 12:45.
You can delete a foreign key constraint in SQL Server by using SQL Server Management Studio or Transact-SQL. Deleting a foreign key constraint removes the requirement to enforce referential integrity.
To delete a foreign key from a table, use the ALTER TABLE clause with the name of the table (in our example, student) followed by the clause DROP CONSTRAINT with the name of the foreign key constraint. In our example, the name of this constraint is fk_student_city_id.
8 gru 2021 · The MySQL ERROR 1452 happens when you try to execute a data manipulation query into a table that has one or more failing foreign key constraints. The cause of this error is the values you’re trying to put into the table are not available in the referencing (parent) table.
The FK.is_disabled holds the "Enforce Foreign Key Constraint" attribute and it should add a second alter for FKs with FK.is_disabled=0 that disables the FK (ALTER TABLE <mytable> NOCHECK CONSTRAINT <myconstraint>).
The DROP CONSTRAINT command is used to delete a UNIQUE, PRIMARY KEY, FOREIGN KEY, or CHECK constraint. DROP a UNIQUE Constraint. To drop a UNIQUE constraint, use the following SQL: SQL Server / Oracle / MS Access: ALTER TABLE Persons DROP CONSTRAINT UC_Person; MySQL: ALTER TABLE Persons DROP INDEX UC_Person; DROP a PRIMARY KEY Constraint.
