Composite Primary Key Setup Guide

1 year ago
Isabella Edwards
1 minute

In a database, a composite key refers to two fields in a table combined together to ensure the uniqueness of each row of data. When setting a composite key, you need to use the CREATE TABLE statement and specify the two fields as the primary key. Here’s an example:

CREATE TABLE example_table (
    id INT,
    name VARCHAR(50),
    PRIMARY KEY (id, name)
);

In the example above, the combination of the id and name fields as the primary key ensures the uniqueness of each row in the table. It is important to note that if a field is auto-incrementing or unique, it can be included as part of the primary key. In practical applications, having a composite primary key can enhance both data query efficiency and data integrity.

bannerAds