When considering database normalization in PHP applications, what are the implications of not using a cross-table approach for linking users to multiple locations?

Not using a cross-table approach for linking users to multiple locations can lead to data redundancy and inconsistency in the database. This can result in difficulties in maintaining and updating the data, as well as potential issues with data integrity. To solve this issue, you can create a separate table to store the relationships between users and locations, using foreign keys to establish the connections. 

CREATE TABLE user_locations (
    user_id INT,
    location_id INT,
    PRIMARY KEY (user_id, location_id),
    FOREIGN KEY (user_id) REFERENCES users(id),
    FOREIGN KEY (location_id) REFERENCES locations(id)
);

Keywords

database normalization cross-table approach PHP applications linking users multiple locations

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