What are the potential drawbacks of using a database structure with comma-separated values for complications in PHP?

Using a database structure with comma-separated values for complications in PHP can lead to difficulties in querying and manipulating the data efficiently. It can also make it challenging to maintain data integrity and normalization. To solve this issue, it is recommended to normalize the database structure by creating separate tables for complications and using relationships to link them to the main data.

// Example of normalizing the database structure for complications

// Create a table for complications
CREATE TABLE complications (
    id INT PRIMARY KEY,
    name VARCHAR(50)
);

// Create a table for main data with a foreign key reference to complications
CREATE TABLE main_data (
    id INT PRIMARY KEY,
    complication_id INT,
    FOREIGN KEY (complication_id) REFERENCES complications(id)
);