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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.
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.
DROP - this will create a command to drop all FK constraints and create a command to create all FK constraints that reference the table are working with. The values below use a table in the AdventureWorks database, so you can just copy and paste this code and run this sample against that database.
The syntax to drop a foreign key in SQL Server (Transact-SQL) is: ALTER TABLE table_name. DROP CONSTRAINT fk_name; Parameters or Arguments. table_name. The name of the table where the foreign key has been created. fk_name. The name of the foreign key that you wish to remove. Example.
You cannot truncate a table that has foreign key constraints. I would script your truncate statement to drop the constraints, then truncate the table, and then re-create the constraints. Because TRUNCATE TABLE is a DDL command, it cannot check to see whether the records in the table are being referenced by a record in the child table.
