以编程方式删除数据库表的主索引

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 删除表的主索引
$sql = "ALTER TABLE table_name DROP INDEX index_name";
if ($conn->query($sql) === TRUE) {
    echo "主索引删除成功";
} else {
    echo "主索引删除失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>