What are the potential pitfalls of storing multiple keywords in a single column in a MySQL database?

Storing multiple keywords in a single column in a MySQL database can make it difficult to search for specific keywords efficiently. It can also lead to data redundancy and make it harder to update or delete individual keywords. To solve this issue, it is recommended to create a separate table to store the keywords in a one-to-many relationship with the main table. 

// Create a separate table to store keywords
CREATE TABLE keywords (
    id INT AUTO_INCREMENT PRIMARY KEY,
    keyword VARCHAR(255)
);

// Create a table to store the main data with a foreign key reference to keywords table
CREATE TABLE main_data (
    id INT AUTO_INCREMENT PRIMARY KEY,
    data VARCHAR(255),
    keyword_id INT,
    FOREIGN KEY (keyword_id) REFERENCES keywords(id)
);

// Insert keywords into the keywords table
INSERT INTO keywords (keyword) VALUES ('keyword1'), ('keyword2'), ('keyword3');

// Insert data into the main_data table with a reference to the keyword_id
INSERT INTO main_data (data, keyword_id) VALUES ('Example data', 1);

Keywords

MySQL database design normalization full-text search indexing

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