將值復制到另一個表

Question

我的代碼有問題。 我有一個名為“ users”的表，其中帶有“ id”字段。我想將id值復制到另一個名為“ aircondition”的表中。 這是將值插入到空調表中的代碼。問題是，當我使用此代碼時，在新的id字段而不是user.id中獲得0。

 <?php
$con=mysqli_connect("localhost","george","george123","my_db");
// Check connection
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

// escape variables for security
$acname = mysqli_real_escape_string($con, $_POST['ACName']);
$btu = mysqli_real_escape_string($con, $_POST['BTU']);
$space = mysqli_real_escape_string($con, $_POST['Space']);
$energyclass = mysqli_real_escape_string($con, $_POST['EnergyClass']);



$sql="INSERT INTO aircondition (id, ACName, BTU, Space,  EnergyClass)
VALUES ('SELECT id
    FROM  users', '$acname', '$btu', '$space', '$energyclass')";

if (!mysqli_query($con,$sql)) {
  die('Error: ' . mysqli_error($con));
}
header('location:aircondition.php');


mysqli_close($con);
?>

Answer 1

使用此查詢

INSERT INTO aircondition (id, ACName, BTU, Space,  EnergyClass)
SELECT id, '$acname', '$btu', '$space', '$energyclass'
FROM  users