MySQL Composite Primary Keys Setup

The method for setting up dual primary keys (also known as composite primary keys) in MySQL is to designate two or more fields as primary keys when creating a table. For example:

CREATE TABLE example_table (
    id1 INT,
    id2 INT,
    PRIMARY KEY (id1, id2)
);

In the example above, the fields id1 and id2 together form a composite primary key. This means that the combination of id1 and id2 must be unique, and each field must also be unique on its own. This allows for the setting of dual primary keys.

When setting up dual primary keys in MySQL, multiple fields can be combined into a composite key to ensure the uniqueness and integrity of data in the table.