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Try to get property'num for PHP database data reading_ rows' of non-object？

2022-07-02 21:55:00 【CSDN Q & A】

// The latest message is displayed in front of
$sql = "SELECT * FROM 'liuyan1' ORDER BY 'liuyan1'.'id' DESC";
$result = $conn->query($sql);

if($result->num_rows > 0){    // Output data     while($row = $result->fetch_assoc()){        ?>

Please show ：Notice: Trying to get property 'num_rows' of non-object in Why

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