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18 wrz 2008 · Your syntax for dropping the FK doesn't need the words "foreign key". This is the syntax for MySQL, not SQL Server. You can replace it with the word "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.
3 mar 2023 · You can disable a foreign key constraint during INSERT and UPDATE transactions in SQL Server by using SQL Server Management Studio or Transact-SQL. Use this option if you know that new data will not violate the existing constraint or if the constraint applies only to the data already in the database.
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.
Check out this tip to automatically create scripts to disable, enable, drop and recreate SQL Server Foreign Keys.
Modify, Delete Foreign Keys in SQL Server. Here you will learn how to modify or delete foreign keys in a table. Foreign key constraint enforces referential integrity in SQL Server database. It is used to create relationships between two tables by associating rows of one table with that of another.
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.
