What are the potential consequences of allowing negative values in a MySQL column in a PHP application?

Allowing negative values in a MySQL column in a PHP application can lead to unexpected behavior and potential errors in calculations or logic that assume only positive values. To prevent this, you can enforce constraints on the column to only allow positive values using MySQL's UNSIGNED attribute. 

// Create a table with a column that only allows positive values
$sql = "CREATE TABLE example_table (
    id INT AUTO_INCREMENT PRIMARY KEY,
    positive_value INT UNSIGNED
)";
$conn->query($sql);

Keywords

MySQL PHP application negative values data integrity error handling

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