What are the potential pitfalls of combining multiple values into a single column in a SQL table when using PHP?

Combining multiple values into a single column in a SQL table can make it difficult to query and manipulate the data effectively. It can also violate database normalization principles, leading to data redundancy and inconsistency. To solve this issue, it is recommended to create separate columns for each value that needs to be stored. 

// Create separate columns for each value
$sql = "CREATE TABLE users (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    first_name VARCHAR(30) NOT NULL,
    last_name VARCHAR(30) NOT NULL,
    email VARCHAR(50) NOT NULL
)";
$conn->query($sql);

Keywords

SQL PHP database design normalization data integrity

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