如何在PHP中仅选择和显示年份起始日期(MySQL)

$servername = "数据库服务器地址";
$username = "用户名";
$password = "密码";
$dbname = "数据库名";

// 使用mysqli扩展连接数据库
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 使用PDO连接数据库
try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    die("连接失败: " . $e->getMessage());
}

// 使用mysqli扩展执行查询
$sql = "SELECT MIN(YEAR(date_column)) AS start_year FROM your_table";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    $startYear = $row["start_year"];
} else {
    $startYear = "没有数据";
}

// 使用PDO执行查询
$sql = "SELECT MIN(YEAR(date_column)) AS start_year FROM your_table";
$stmt = $conn->prepare($sql);
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$startYear = $row["start_year"];

echo "起始日期: " . $startYear;