php mysql按月查询

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

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询语句，按月分组并计算每个月的记录数
$sql = "SELECT YEAR(date_column) as year, MONTH(date_column) as month, COUNT(*) as count 
        FROM table_name 
        GROUP BY YEAR(date_column), MONTH(date_column) 
        ORDER BY year, month";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "Year: " . $row["year"]. " - Month: " . $row["month"]. " - Count: " . $row["count"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();
?>