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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.
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.
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.
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.
Use the ALTER TABLE DROP CONSTRAINT command to delete a foreign key constraint in an existing 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>).
21 kwi 2011 · Foreign key constraints may be created by referencing a primary or unique key. Foreign key constraints ensure the relational integrity of data in associated tables. A foreign key value may be NULL and indicates a particular record has no parent record.
