In the context of PHP and MySQL, how can the logic of comparing multiple columns be effectively implemented to filter results based on specific criteria?

When comparing multiple columns in PHP and MySQL to filter results based on specific criteria, you can use the WHERE clause in your SQL query to specify the conditions for comparison. You can combine multiple conditions using logical operators such as AND and OR to create complex filtering criteria. 

<?php
// Establish a connection to the MySQL database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Define the criteria for filtering results based on multiple columns
$condition = "column1 = 'value1' AND column2 > 100";

// Create the SQL query with the WHERE clause to filter results
$query = "SELECT * FROM table_name WHERE $condition";

// Execute the query and fetch the results
$result = mysqli_query($connection, $query);

// Process the fetched results as needed
while($row = mysqli_fetch_assoc($result)) {
    // Process each row of data
}

// Close the database connection
mysqli_close($connection);
?>

Keywords

PHP MySQL logic multiple columns filtering

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