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Alter Table Add Constraint Foreign Key Mysql. Create table products. CREATE TABLE parent id INT KEY ENGINEInnoDB.
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Write a SQL statement to add a foreign key constraint named fk_job_id on job_id column of job_history table referencing to the primary key job_id of jobs table. Dropping and redefining a regular key in one statement is possible. We can add a FOREIGN KEY constraint to a column of an existing MySQL table with the help of ALTER TABLE statement.
Add FOREIGN KEY Constraint Using ALTER TABLE Statement.
In the above query table_name is the the table where you want to add foreign key. Create table products. A foreign key is a type of constraint and so if you want to create a foreign key in SQL Server youll need to create a foreign key constraint. The constraint_name is the name of the foreign key that was added during the creation or alteration of a table.
