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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".
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 drop a primary key from a table, use an ALTER TABLE clause with the name of the table (in our example, product) followed by the clause DROP PRIMARY KEY. Since a table can have only one primary key, you don’t need to specify the primary key column (s).
Solution: Discussion: 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.
Check out this tip to automatically create scripts to disable, enable, drop and recreate SQL Server Foreign Keys.
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.
