如何将基于日期和无计划计算出每个数据存储在用php代码创建的表中以显示

<?php
// 连接到数据库
$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);
}

// 创建表
$sql = "CREATE TABLE IF NOT EXISTS data (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    date DATE,
    value INT(6)
)";

if ($conn->query($sql) === TRUE) {
    echo "表创建成功";
} else {
    echo "创建表时出错: " . $conn->error;
}

$conn->close();
?>

<?php
// 连接到数据库
$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);
}

// 计算数据并插入表中
$date = date("Y-m-d"); // 当前日期
$value = 10; // 假设计算得到的值为10

$sql = "INSERT INTO data (date, value) VALUES ('$date', '$value')";

if ($conn->query($sql) === TRUE) {
    echo "数据插入成功";
} else {
    echo "插入数据时出错: " . $conn->error;
}

$conn->close();
?>

<?php
// 连接到数据库
$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);
}

// 从表中检索数据
$sql = "SELECT * FROM data";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "日期: " . $row["date"]. " - 值: " . $row["value"]. "<br>";
    }
} else {
    echo "没有数据";
}

$conn->close();
?>