Can a foreign key Autoincrement?
Foreign Key — A foreign key is just a referential constraint between two tables. If a Primary key is used in the another table then it would be know in the another table as Foreign key which can accept multiple null value. Foreign key always generates after Primary key. Thus they do not automatically increments.
Can a foreign key have multiple attributes?
A Foreign Key is a database key that is used to link two tables together. The FOREIGN KEY constraint differs from the PRIMARY KEY constraint in that, you can create only one PRIMARY KEY per each table, with the ability to create multiple FOREIGN KEY constraints in each table by referencing multiple parent table.
How to use an auto incremented primary key as a foreign key?
How to use an auto incremented primary key as a foreign key as well? I have 2 tables… As you can see the table parent has an auto-incremented primary key “id”, which is also being used as a foreign key for the child table.
How to auto increment quizid with foreign key?
As commented, since you are creating one-to-many relationship, you should make the quizId foreign key and the questionId auto increment primary key (as you did). Note that if you make quizId both primary and foreign you can make it also auto increment, but this is not what you want…. share|improve this answer.
How to use auto incremented primary key in MySQL?
If I start by creating a record in the child table, set it’s parent_id to 1, then reset the auto-increment counter of the parent table (so that the next insert will have id = 1), it works! But that’s not a solution. I don’t see the utility of the insert blocking if there is no related row in the child table…
How to add auto increment to a table?
Method to add AUTO_INCREMENT to a table with data while avoiding “ Duplicate entry ” error: Make a copy of the table with the data using INSERT SELECT: Copy data back to originalTable (do not include the newly created column (id), since it will be automatically populated)