In what scenarios would using REPLACE INTO be more appropriate than INSERT INTO when copying data between tables in PHP?

When copying data between tables in PHP, using REPLACE INTO may be more appropriate than INSERT INTO in scenarios where you want to update existing records if they already exist based on a unique key. REPLACE INTO will insert a new record if it does not already exist, or update the existing record if it does. This can be useful when you want to ensure data integrity and avoid duplicate entries in your tables. 

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Copy data from one table to another using REPLACE INTO
$sql = "REPLACE INTO destination_table SELECT * FROM source_table";
if ($conn->query($sql) === TRUE) {
    echo "Data copied successfully";
} else {
    echo "Error copying data: " . $conn->error;
}

$conn->close();
?>

Keywords

REPLACE INTO INSERT INTO data copying tables PHP

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