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3 cze 2015 · Find out the name of the foreign key: SHOW CREATE TABLE your_table_name; then you can drop it using the following command: ALTER TABLE your_table_name DROP FOREIGN KEY foreign_key_name;
22 sty 2017 · Remove both the CONSTRAINT name and the FOREIGN KEY name: ALTER TABLE table_name DROP FOREIGN KEY the_name_after_CONSTRAINT, DROP KEY the_name_after_FOREIGN_KEY; Hope this helps!
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 drop a foreign key constraint using the following ALTER TABLE syntax: ALTER TABLE tbl_name DROP FOREIGN KEY fk_symbol; If the FOREIGN KEY clause defined a CONSTRAINT name when you created the constraint, you can refer to that name to drop the foreign key constraint. Otherwise, a constraint name was generated internally, and you must use ...
The following SQL command adds a Foreign Key to an existing table. ALTER TABLE Subject ADD FOREIGN KEY (StudentID) REFERENCES Student(StudentID); Drop foreign key MySQL. For dropping a Foreign key from a MySQL table, you need to know the name of the foreign key first. You can get the name of the foreign key by show create table command as follows.
FOREIGN KEY on ALTER TABLE. To create a FOREIGN KEY constraint on the "PersonID" column when the "Orders" table is already created, use the following SQL: ALTER TABLE Orders. ADD FOREIGN KEY (PersonID) REFERENCES Persons (PersonID); To allow naming of a FOREIGN KEY constraint, and for defining a .
6 lut 2024 · The SQL syntax to drop a FOREIGN KEY constraint is: ALTER TABLE child_table_name DROP FOREIGN KEY constraint_name; Replace ‘child_table_name’ with the name of the table from which you want to remove the constraint and ‘constraint_name’ with the name of the FOREIGN KEY constraint.
